JP4327687B2 - High temperature steam electrolyzer - Google Patents

Description

 The present invention relates to a high temperature steam electrolysis apparatus that modularizes a high temperature steam electrolysis cell.

  This type of high-temperature steam electrolysis method is a method of electrolyzing high-temperature steam to obtain hydrogen gas and oxygen gas, and an electrolysis method based on a reverse reaction of a solid electrolyte fuel cell is known in relation to its operating temperature range (for example, , See Patent Document 1).

 As disclosed in Patent Document 1, the main components of the water vapor electrolysis apparatus are composed of a cylindrical electrolysis cell, a water vapor supply chamber, a generated hydrogen discharge chamber, and an oxygen generation chamber.

 A metal cap for current leads is attached to one end of a cylindrical electrolytic cell, and the other end has a completely closed structure by a seal cap. For this reason, the supply / discharge of fuel to / from the cylindrical electrolysis cell is performed only from one end. In addition, a cylindrical electrolysis cell is supported at a seal portion with a tube plate that separates the product hydrogen discharge chamber and the oxygen production chamber.

  A power feeding method will be described. The hydrogen electrode side lead portion is taken out via a taper type ceiling. The oxygen electrode side lead portion is introduced into the electrolysis cell with the cell lead portion at the lower end of the electrolysis cell fixed to the seal cap, and taken out from the collecting metal cap through the reducing atmosphere.

In the steam electrolysis apparatus configured as described above, the gas seal portion on the hydrogen side / oxygen side has two locations above and below the cell, and the gas seal portion has a seal structure including the cell lead portion in any case. Therefore, it is difficult to realize a reliable and reliable seal.
Japanese Patent No. 2930326

 In the conventional high-temperature steam electrolysis apparatus described above, the hydrogen-side and oxygen-side gas seal portions are located at two locations above and below the cell, and the gas seal portion is any of the gas seal portions that separate hydrogen and oxygen. Even in this case, since the cell lead portion is interposed, it is difficult to realize a reliable and reliable seal.

 Also, a problem related to a structure for supplying an electrolytic current uniformly to a cylindrical electrolytic cell that performs electrolysis under an operating temperature of about 900 ° C. and an oxidizing / reducing atmosphere, that is, taking out cell lead portions of a hydrogen electrode and an oxygen electrode Therefore, when configuring a high-efficiency high-temperature steam electrolyzer that requires a large current supply, there has been a problem to be solved, such as disconnection due to heat generation, causing failure.

 Furthermore, how to absorb the difference in coefficient of thermal expansion between the materials constituting the cylindrical electrolytic cell and apparatus that performs electrolysis under an operating temperature of about 900 ° C. and an oxidizing / reducing atmosphere is a major issue. .

  The present invention has been made to solve the above-described problems. The gas seals on the hydrogen side and oxygen side during high-temperature operation have a reliable and reliable structure, and the electrolytic current is uniformly supplied to the electrodes of the electrolysis cell. An object of the present invention is to provide a high-temperature steam electrolysis apparatus that can be used.

In order to achieve the above object, in the high-temperature steam electrolysis apparatus of the present invention, a cylindrical steam electrolysis cell having a hydrogen electrode on the inside and an oxygen electrode on the outside and having at least one disposed closed bottom, A steam supply chamber provided above the steam electrolysis cell and supplied with steam, a steam injection pipe suspended from the steam supply chamber and supplying steam to the inside of the steam electrolysis cell, and provided below the steam supply chamber A generated hydrogen discharge chamber for extracting hydrogen generated at the hydrogen electrode out of the system, an oxygen generation chamber provided at a lower portion of the generated hydrogen discharge chamber for extracting oxygen generated by adjusting the atmosphere of the oxygen electrode, and the steam electrolysis a hydrogen electrode resilient power supply means for supplying an electrolytic current to the hydrogen electrode is disposed inside the cell, the oxygen electrode resilient power supply means for supplying an electrolytic current to the oxygen electrode provided inside the oxygen generating chamber An insulating layer is interposed between the water vapor supply chamber and the oxygen generation chamber, an electrolysis current is supplied from the water vapor supply chamber to the hydrogen electrode, and an electrolysis current is supplied from the outer wall of the oxygen generation chamber to the oxygen electrode. It is characterized by supplying .

In order to achieve the above object, in the high-temperature steam electrolysis apparatus of the present invention, a cylindrical steam electrolysis cell having an oxygen electrode on the inside and at least one hydrogen electrode on the outside and having a closed lower end When the oxygen electrode atmosphere supply chamber oxygen electrode atmosphere containing air disposed above the steam electrolysis cell is supplied, the oxygen electrode atmosphere is suspended from the oxygen electrode atmosphere supply chamber inside the steam electrolysis cell fed An oxygen electrode atmosphere injection tube, a generated oxygen discharge chamber provided at a lower portion of the oxygen electrode atmosphere supply chamber, for adjusting the oxygen electrode atmosphere and taking out generated oxygen out of the system, and a lower portion of the generated oxygen discharge chamber. steam is supplied, to generate hydrogen by the electrode reaction in the hydrogen electrode from the water vapor, and hydrogen generating chamber to take out the hydrogen produced in the hydrogen electrode, disposed inside of the steam electrolysis cell Are the a and the oxygen electrode resilient power supply means for supplying the oxygen electrode to the electrolytic current, and a hydrogen electrode resilient power supply means for supplying an electrolytic current to the hydrogen electrode provided inside the hydrogen generator chamber, said oxygen electrode atmosphere supply An insulating layer is interposed between the oxygen generation chamber and the hydrogen generation chamber, an electrolysis current is supplied from the oxygen electrode atmosphere supply chamber to the oxygen electrode, and an electrolysis current is supplied from the outer wall of the hydrogen generation chamber to the hydrogen electrode. It is characterized by that.

  According to the present invention, gas leakage of hydrogen and oxygen is prevented, an electrolysis current is uniformly supplied to the electrodes of the steam electrolysis cell, and further, the thermal expansion coefficient difference between the materials constituting the steam electrolysis cell and the apparatus is absorbed. As a result, it is possible to provide a high temperature steam electrolysis apparatus that has a highly reliable gas seal, has a strong structure, and can supply a large amount of power.

  Hereinafter, an embodiment of a high-temperature steam electrolysis apparatus according to the present invention will be described with reference to FIGS. 1 to 6. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

  First, a first embodiment of the present invention will be described.

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

  As shown in FIG. 1, the high temperature steam electrolysis apparatus is provided with one or a plurality of cylindrical steam electrolysis cells 1 and 1a. Here, as an example, a cylindrical steam electrolysis cell 1 (hereinafter referred to as “cylindrical cell”) will be described.

  The cylindrical cells 1 and 1a are closed at the lower end, and have a hydrogen electrode 21 on the inside and an oxygen electrode 31 on the outside.

  A steam supply chamber 2 is constructed in the upper part of the high-temperature steam electrolysis apparatus. The water vapor supply chamber 2 is supplied with water vapor 41, and the water vapor 41 is supplied to the hydrogen electrode 21 of the cylindrical cell 1 through the water vapor injection pipe 3.

  A DC power supply 45 applies a negative voltage to the hydrogen electrode 21 and a positive voltage to the oxygen electrode 31. Then, hydrogen is generated at the hydrogen electrode 21 and oxygen is generated at the oxygen electrode 31 by electrolysis of water vapor.

  The hydrogen 42 generated by the electrode reaction in the hydrogen electrode 21 of the cylindrical cell 1, 1 a is discharged to the generated hydrogen discharge chamber 4 formed at the lower part of the water vapor supply chamber 2 and finally taken out of the system.

  An oxygen generation chamber 5 is configured below the generated hydrogen discharge chamber 4, and an oxygen electrode atmosphere 43 such as air is supplied. The oxygen electrode atmosphere 43 adjusts the atmosphere on the oxygen electrode 31 side outside the cylindrical cell 1, and oxygen 44 generated by the electrode reaction in the oxygen electrode 31 of the cylindrical cells 1 and 1a is taken out of the system.

  The cylindrical cell 1 is formed uniformly throughout, and details are shown in FIG. The inner side is formed from an inner wall made of the hydrogen electrode 21 and serves as a negative electrode. An electrolyte layer made of a solid electrolyte type electrolyte 35 is formed on the outer peripheral surface of the inner wall made of the hydrogen electrode 21.

  A positive electrode made of the oxygen electrode 31 is further formed on the outer peripheral surface of the electrolyte layer made of the electrolyte 35. A mesh functioning as a current collector 23 is formed as an outer wall on the outer peripheral surface of the oxygen electrode layer formed of the oxygen electrode 31. That is, the current collector 23 is formed by winding a mesh formed of gold or platinum around the surface of the oxygen electrode 31 outside the cylindrical cell 1, and the electrolytic current is uniformly supplied to the entire electrode surface of the oxygen electrode 31. can do. Here, instead of the mesh, a conductive and elastic member such as a structure in which a gold or platinum wire is spirally wound, a felt-like structure, or a porous conductive oxide is used. The electric body 23 may be formed.

  As described above, the cylindrical steam electrolysis cell 1 has a layer composed of the hydrogen electrode 21, the electrolyte 35, the oxygen electrode 31, and the current collector 23 formed from the inside with good adhesion.

  FIG. 3 shows a cylindrical cell 1a having another configuration. FIG. 3 is a modification of the configuration of FIG. 2 and mainly describes a configuration different from FIG. The cylindrical cell 1a is formed by previously joining a support tube 6 having a thermal expansion coefficient equivalent to that of the cylindrical cell 1 shown in FIG. When the support tube 6 is used, it is necessary to insulate the inside and the outside of the support tube 6. Further, the oxygen electrode 31 outside the cylindrical cell 1 and the wall surface of the oxygen generation chamber 5 are made conductive by giving conductivity to the outer surface of the support tube 6 or connecting them with a lead wire or the like separately provided. It is necessary to keep.

  A guide plate 7 is provided in the oxygen generation chamber 5. The guide plate 7 is made of a conductive material and extends from the wall of the oxygen generation chamber 5 to the periphery of the cylindrical cells 1 and 1a. Even when the guide plate 7 is installed, the upper and lower rooms formed by the guide plate 7 are open.

  As shown in FIG. 1 as an example, the cylindrical cells 1 and 1a are formed from one or more alloys selected from nickel, gold and platinum, and are formed from a side surface through an elastic power supply terminal 32 processed into a spring shape. Fixed.

  Further, inside the cylindrical cell 1, for example, an elastic power supply terminal 22 formed of one or more alloys selected from nickel, gold, and platinum and processed into a spring shape is disposed. With this elastic power supply terminal 22, the hydrogen electrode 21 in the cylindrical cells 1, 1 a and the water vapor injection pipe 3 are brought into contact with each other. This spring-like elastic power supply terminal 22 is arranged from the center of the cylindrical cell 1 so as not to prevent a relative position change between the cylindrical cell 1 and the water vapor supply pipe 3 due to the flow of steam 41 inside the cylindrical cell 1 or a temperature change. You may provide a clearance radially. Further, instead of the spring-shaped elastic power supply terminal 22, a power supply terminal having a mesh or felt structure may be used.

  In the present embodiment, since the water vapor introducing tube 3 and the guide plate 7 are formed of a conductive material, the water vapor introducing tube 3 and the guide plate 7 are formed of the hydrogen electrode 21 and the cylindrical cell 1 inside the cylindrical cell 1. It can be used as a current lead terminal for supplying an electrolytic current to the oxygen electrode 31 on the outside. At this time, it is necessary to prevent a short circuit between the hydrogen electrode 21 and the oxygen electrode 31 by interposing the insulating layer 8 between the water vapor supply chamber 2 and the oxygen generation chamber 5.

  In addition, the steam supply chamber 2 and the steam injection pipe 3 are connected, and the oxygen generation chamber 5 and the guide plate 7 are electrically connected, so that the outer wall of the steam supply chamber 2 is connected to the hydrogen electrode 21 of the cylindrical cell 1. An electrolytic current can be supplied. In addition, an electrolytic current can be supplied from the outer wall of the oxygen generation chamber 5 to the oxygen electrode 31 of the cylindrical cell.

  Further, between the closed end of the cylindrical cells 1 and 1a and the inner wall of the oxygen generation chamber 5, for example, an elastic power supply terminal 52 formed of felt-like platinum is installed to ensure electrical contact, The structural stability can be further improved by fixing the cylindrical cells 1 and 1a at the two points of the tip and the base.

  The open portions of the cylindrical cells 1, 1 a are fixed to the wall surface of the generated hydrogen discharge chamber 4 via a seal material 9 formed of glass and a ceramic composite material. The connecting portion 10 of the cylindrical cell 1 in contact with the sealing material 9 and the cell connecting portion 11 of the generated hydrogen discharge chamber 4 are provided with an annular or spiral notch in advance, thereby effectively preventing gas leakage and the cylindrical cell. 1, 1a can be firmly fixed to the wall surface of the product hydrogen discharge chamber 4.

  According to this embodiment, hydrogen and oxygen gas leaks are prevented, an electrolytic current is supplied uniformly to the electrodes of the cylindrical cell 1, and further, the thermal expansion coefficient difference between the cylindrical cell 1 and the material constituting the apparatus is absorbed. By doing so, it is possible to manufacture a high-temperature steam electrolysis apparatus that has a highly reliable gas seal, has a strong structure, and can supply a large amount of power.

  Although FIG. 1 shows an example in which two types of cylindrical cells 1 and 1a are arranged in parallel in one high-temperature steam electrolysis apparatus, only one or a plurality of cylindrical cells 1 or 1a may be arranged. Good.

  Next, a second embodiment of the present invention will be described.

  FIG. 4 is a schematic longitudinal sectional view showing the configuration of the high-temperature steam electrolyzer according to the second embodiment of the present invention.

  As shown in FIG. 4, the high temperature steam electrolysis apparatus is provided with one or a plurality of cylindrical cells 51, 51a. The cylindrical cells 51 and 51a are closed at one end, and have an oxygen electrode 31 on the inner side and a hydrogen electrode 21 on the outer side.

  That is, in the cylindrical cells 51 and 51a, the oxygen electrode 31 and the hydrogen electrode 21 are arranged oppositely on the inner side and the outer side as compared with the cylindrical cells 1 and 1a shown in FIG.

  In the upper part of the high-temperature steam electrolysis apparatus, an oxygen electrode atmosphere supply chamber 12 is constructed. The oxygen electrode atmosphere supply chamber 12 is supplied with an oxygen electrode atmosphere 43 such as air in order to adjust the atmosphere on the oxygen electrode 31 side inside the cylindrical cells 51 and 51a.

  The oxygen electrode atmosphere 43 such as air supplied to the oxygen electrode atmosphere supply chamber 12 is supplied to the oxygen electrode 31 inside the cylindrical cells 51, 51 a via the oxygen electrode atmosphere tube 13.

  A generated oxygen discharge chamber 14 is constructed below the oxygen electrode atmosphere supply chamber 12. Oxygen 44 generated by the electrode reaction in the oxygen electrode 31 of the cylindrical cells 51 and 51a is discharged to the generated oxygen discharge chamber 14 and finally taken out of the system.

  A hydrogen generation chamber 15 is disposed below the generated oxygen discharge chamber 14. Steam 41 is supplied to the hydrogen generation chamber 15. The supplied water vapor 41 undergoes an electrode reaction at the hydrogen electrode 21 outside the cylindrical cells 51 and 51a. Hydrogen 42 generated by this electrode reaction is discharged into the hydrogen generation chamber 15 and finally recovered from the outlet of the generated hydrogen 42.

  The cylindrical cell 51 is formed uniformly throughout, and details are shown in FIG. The inner side is formed from the inner wall made of the oxygen electrode 31 and represents the positive electrode. An electrolyte layer made of a solid electrolyte type electrolyte 35 is formed on the outer peripheral surface of the inner wall made of the oxygen electrode 31.

  On the outer peripheral surface of the electrolyte layer made of the electrolyte 35, a negative electrode made of the hydrogen electrode 21 is further formed. A mesh functioning as a current collector 23 is formed as an outer wall on the outer peripheral surface of the hydrogen electrode layer composed of the hydrogen electrode 21. The current collector 23 is formed by winding a mesh formed of one or more alloys selected from nickel, gold and platinum around the surface of the hydrogen electrode 21 outside the cylindrical cell 51, The electrolytic current can be uniformly supplied to the entire electrode surface of the electrode 21. Here, the current collector 23 can be formed using a structure in which a wire made of gold or platinum is spirally wound, a felt-like structure, or a porous conductive oxide instead of a mesh. .

  Thus, the cylindrical cell 51 has a layer composed of the oxygen electrode 31, the electrolyte 35, the hydrogen electrode 21, and the current collector 23 formed from the inside with good adhesion.

  FIG. 6 shows a cylindrical cell 51a having another configuration. FIG. 6 is added to the configuration of FIG. 5 and mainly describes a configuration different from FIG. The cylindrical cell 51a is formed by previously joining a support tube 6 having a thermal expansion coefficient equivalent to that of the cylindrical cell 51 shown in FIG. When the support tube 6 is used, it is necessary to insulate the inside and the outside of the support tube 6. In addition, the hydrogen electrode 21 outside the cylindrical cell 51a and the wall surface of the hydrogen generation chamber 15 are made conductive by giving conductivity to the outer surface of the support tube 6 or by connecting them with a separately provided lead wire or the like. It is necessary to keep

  A guide plate 7 is provided in the hydrogen generation chamber 15. The guide plate 7 and the side surface of the cylindrical cell 51a are fixed via an elastic power supply terminal 32a formed of, for example, one or more alloys selected from nickel, gold, and platinum and processed into a spring shape. . Inside the cylindrical cells 51, 51a, for example, an elastic power supply terminal 22a formed of one or more alloys selected from nickel, gold and platinum and processed into a spring shape is provided, and the oxygen electrode of the cylindrical cell 51 is provided. 31 and the oxygen electrode atmosphere injection tube 13 are brought into contact with each other. This spring-like elastic power supply terminal 22a does not hinder the relative position change between the cylindrical cells 51, 51a and the oxygen electrode atmosphere injection tube 13 due to the flow of steam gas or the temperature change inside the cylindrical cells 51, 51a. You may provide a clearance radially from the center of the cylindrical cells 51 and 51a. Further, instead of these spring-like elastic power supply terminals 22a, power supply terminals having a mesh or felt-like structure may be used.

  In the present embodiment, since the oxygen electrode atmosphere injection tube 13 and the guide plate 7 are made of a conductive material, the oxygen electrode 31 existing inside the cylindrical cells 51, 51a and the outside of the cylindrical cell 51 exist. It can be used as a current lead terminal for supplying an electrolytic current to the hydrogen electrode 21. At this time, the oxygen electrode atmosphere supply chamber 12 and the hydrogen generation chamber 15 need to prevent a short circuit between the hydrogen electrode 21 and the oxygen electrode 31 by interposing the insulating layer 8.

  Further, the oxygen electrode atmosphere supply chamber 12 and the oxygen electrode atmosphere injection tube 13 are electrically connected to supply an electrolytic current from the outer wall of the oxygen electrode atmosphere supply chamber 12 to the oxygen electrode atmosphere supply chamber 12 of the cylindrical cell 1. Can do. Further, by electrically connecting the hydrogen generation chamber 15 and the guide plate 7, an electrolytic current can be supplied from the outer wall of the hydrogen generation chamber 15 to the hydrogen electrode 21 of the cylindrical cell.

  Also, an elastic power supply terminal 52a made of, for example, felt-like nickel or platinum is installed between the closed end tips of the cylindrical cells 51 and 51a and the inner wall of the hydrogen generation chamber 15 to ensure electrical contact and the cylinder. The structural stability can be improved by fixing the cells 51 and 51a at two points of the tip and the base.

  The open ends of the cylindrical cells 51 and 51a are fixed to the wall surface of the product oxygen discharge chamber 14 via a sealing material 9 formed of glass and a ceramic composite material. By providing an annular or spiral notch in advance in the connecting portion 10 of the cylindrical cells 51 and 51a in contact with the sealing material 9 and the cell connecting portion 16 of the generated oxygen discharge chamber 14, gas leakage is effectively prevented, The cylindrical cells 51 and 51a can be firmly fixed to the wall surface of the product oxygen discharge chamber 14.

  According to the present embodiment, gas leakage between hydrogen and oxygen is prevented, an electrolytic current is uniformly supplied to the cell electrode, and further, a difference in thermal expansion coefficient between the cylindrical cell and the material constituting the device is absorbed. A high-temperature steam electrolysis apparatus that has a highly reliable gas seal, has a strong structure, and can supply a large amount of power can be manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic longitudinal cross-sectional view which shows the structure of the high temperature steam electrolysis apparatus of 1st Embodiment by this invention. The longitudinal cross-sectional view which shows the structure of the cylindrical steam electrolysis cell of FIG. The longitudinal cross-sectional view which shows the other structure of the cylindrical steam electrolysis cell of FIG. The schematic longitudinal cross-sectional view which shows the structure of the high temperature steam electrolyzer of 2nd Embodiment by this invention. The longitudinal cross-sectional view which shows the structure of the cylindrical steam electrolysis cell of FIG. The longitudinal cross-sectional view which shows the other structure of the cylindrical steam electrolysis cell of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1a, 51,51a ... Cylindrical steam electrolysis cell, 2 ... Steam supply chamber, 3 ... Steam injection tube, 4 ... Production hydrogen discharge chamber, 5 ... Oxygen production chamber, 6 ... Support tube, 7 ... Guide plate, 8 DESCRIPTION OF SYMBOLS ... Insulating layer, 9 ... Sealing material, 10 ... Connection part of cylindrical cell, 11 ... Cell connection part of product hydrogen discharge chamber, 12 ... Oxygen electrode atmosphere supply chamber, 13 ... Oxygen electrode atmosphere injection tube, 14 ... Product oxygen discharge chamber 15 ... hydrogen generation chamber, 16 ... cell connection part of the generated oxygen discharge chamber, 21 ... hydrogen electrode, 22, 22a, 32, 32a, 52, 52a ... elastic power supply terminal, 23 ... current collector, 31 ... oxygen electrode, 35 ... electrolyte, 41 ... water vapor, 42 ... generated hydrogen, 43 ... oxygen atmosphere, 44 ... generated oxygen, 45 ... direct current power source.

Claims (11)

A cylindrical steam electrolysis cell having a hydrogen electrode on the inside and an oxygen electrode on the outside and having a lower end closed,
A steam supply chamber provided above the steam electrolysis cell and supplied with steam;
A water vapor injection pipe that hangs down from the water vapor supply chamber and supplies water vapor to the inside of the water vapor electrolysis cell;
A generated hydrogen discharge chamber provided at a lower portion of the water vapor supply chamber to extract hydrogen generated at the hydrogen electrode out of the system;
An oxygen generation chamber provided at a lower portion of the generated hydrogen discharge chamber to take out oxygen generated by adjusting the atmosphere of the oxygen electrode;
Hydrogen polar elastic power supply means disposed inside the steam electrolysis cell and supplying an electrolytic current to the hydrogen electrode;
An oxygen polar elastic power supply means provided inside the oxygen generation chamber for supplying an electrolytic current to the oxygen electrode ;
An insulating layer is interposed between the water vapor supply chamber and the oxygen generation chamber;
An electrolysis current is supplied from the steam supply chamber to the hydrogen electrode, and an electrolysis current is supplied from the outer wall of the oxygen generation chamber to the oxygen electrode .   The hydrogen electrode elastic power feeding means is formed of one or more alloys selected from nickel, gold and platinum provided between a water vapor injection tube formed of a conductive material and the hydrogen electrode. The high-temperature steam electrolysis apparatus according to claim 1, further comprising a mesh or a spring.   The oxygen elastic electrode power feeding means is formed by winding a wire made of one or more alloys selected from nickel, gold and platinum around the outer surface of the steam electrolysis cell in a spiral shape or as a mesh. The high-temperature steam electrolysis apparatus according to claim 1 or 2, further comprising a current collector formed of an electric conductor or a porous conductive oxide.   The said oxygen elastic electrode electric power feeding means comprises the electric power feeding terminal provided between the outer peripheral surface of the said steam electrolysis cell, and the guide plate provided in the inside of the said oxygen production | generation chamber, The 1 thru | or characterized by the above-mentioned. 4. The high temperature steam electrolyzer according to any one of 3 above. A mesh or spring formed of one or more alloys selected from nickel, gold and platinum is provided between the lower end of the steam electrolysis cell and the inner wall of the oxygen generation chamber. The high temperature steam electrolyzer according to any one of claims 1 to 4 . 2. An annular or spiral notch is provided on the upper outer surface of the steam electrolysis cell in contact with a seal portion fixed to the wall surface of the product hydrogen discharge chamber and the wall surface of the product hydrogen discharge chamber. The high-temperature steam electrolysis apparatus according to any one of 5 . A cylindrical steam electrolysis cell having an oxygen electrode on the inside and a hydrogen electrode on the outside and having a closed lower end,
An oxygen electrode atmosphere supply chamber provided above the steam electrolysis cell and supplied with an oxygen electrode atmosphere containing air ;
And inside it said oxygen supplying electrode atmosphere oxygen electrode atmosphere inlet tube of the steam electrolysis cell is suspended from the oxygen electrode atmosphere supply chamber,
A generated oxygen discharge chamber provided in a lower part of the oxygen electrode atmosphere supply chamber to extract oxygen generated by adjusting the oxygen electrode atmosphere ;
A hydrogen generation chamber provided in a lower portion of the generated oxygen discharge chamber, supplied with water vapor, generates hydrogen by an electrode reaction at the hydrogen electrode from the water vapor, and takes out the hydrogen generated at the hydrogen electrode;
An oxygen polar elastic power supply means that is disposed inside the steam electrolysis cell and supplies an electrolysis current to the oxygen electrode;
And a hydrogen electrode resilient power supply means for supplying an electrolytic current to the hydrogen electrode provided inside the hydrogen generator chamber,
Interposing an insulating layer between the oxygen electrode atmosphere supply chamber and the hydrogen generation chamber;
An electrolysis current is supplied from the oxygen electrode atmosphere supply chamber to the oxygen electrode, and further an electrolysis current is supplied from the outer wall of the hydrogen generation chamber to the hydrogen electrode. The oxygen electrode supply elastic electric means is made of one or more alloys selected from nickel, gold and platinum provided between an oxygen electrode atmosphere injection tube formed of a conductive material and the oxygen electrode. The high-temperature steam electrolysis apparatus according to claim 7, further comprising a formed mesh or spring . The hydrogen polar elastic power supply means is formed by winding a wire made of one or two or more alloys selected from nickel, gold and platinum around the outer surface of the steam electrolysis cell in a spiral shape or as a mesh. The high-temperature steam electrolysis apparatus according to claim 7 or 8, further comprising a current collector formed of an electric body or a porous conductive oxide . The oxygen oxygen elastic power supply means includes a power supply terminal provided between an outer peripheral surface of the steam electrolysis cell and a guide plate provided in the hydrogen generation chamber. The high temperature steam electrolysis apparatus according to any one of 9 . A mesh or spring formed of one or more alloys selected from nickel, gold, and platinum is provided between the lower end of the steam electrolysis cell and the inner wall of the hydrogen generation chamber. The high temperature steam electrolyzer according to any one of claims 7 to 10 .

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