Synthetic fuel production equipment, synthetic fuel production system

Abstract

The present invention provides a synthetic fuel production apparatus and synthetic fuel production system that can effectively utilize the heat generated in the synthetic fuel production section. [Solution] The synthetic fuel production device 10A has a water electrolysis cell 20A in which an anode current collector layer 21, an anode gas diffusion layer 22, an anode catalyst layer 23, an electrolyte layer 24, a cathode catalyst layer 25, a cathode gas diffusion layer 26, and a cathode current collector layer 27 are stacked radially, and comprises a cylindrical water electrolysis unit 20 that electrolyzes water to produce hydrogen and oxygen, a cylindrical inner insulating layer 42 disposed inside the cylinder of the water electrolysis unit 20, and a synthetic fuel production unit 32 disposed inside the cylinder of the inner insulating layer 42 that produces a synthetic compound and water from hydrogen and carbon dioxide.

Description

Technical Field

[0001] The technology disclosed in the present application relates to a synthetic fuel generation device and a synthetic fuel generation system.

Background Art

[0002] Patent Document 1 discloses a methane synthesis device including a water electrolysis unit and a Sabatier reaction unit that synthesizes methane by reacting hydrogen and carbon dioxide. In this methane synthesis device, the hydrogen gas generated in the water electrolysis unit is supplied to the Sabatier reaction unit, and methane gas as a synthetic fuel is synthesized from this hydrogen gas and a carbon dioxide-containing gas separately supplied to the Sabatier reaction unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Although an exothermic reaction occurs in the Sabatier reaction unit, it has been difficult to effectively utilize the heat generated in the Sabatier reaction unit in the technology described in Patent Document 1.

[0005] In consideration of the above facts, an object of the present invention is to provide a synthetic fuel generation device and a synthetic fuel generation system capable of effectively utilizing the heat generated in the synthetic fuel generation unit.

Means for Solving the Problems

[0006] The synthetic fuel production apparatus according to the first embodiment has a water electrolysis cell in which an anode current collector layer, an anode gas diffusion layer, an anode catalyst layer, an electrolyte layer, a cathode catalyst layer, a cathode gas diffusion layer, and a cathode current collector layer are stacked radially, and comprises a cylindrical water electrolysis section that electrolyzes water to produce hydrogen and oxygen, a cylindrical insulating layer disposed inside the cylinder of the water electrolysis section, and a synthetic fuel production section disposed inside the cylinder of the insulating layer that produces a synthetic compound and water from hydrogen and carbon dioxide.

[0007] In the first embodiment of the synthetic fuel production apparatus, the synthetic fuel production unit is arranged inside the cylindrical water electrolysis unit with an insulating layer in between. Therefore, the reaction heat generated in the synthetic fuel production unit can be effectively supplied to the water electrolysis unit, and the operating temperature in the water electrolysis unit can be maintained.

[0008] A synthetic fuel production apparatus according to a second embodiment comprises: a cylindrical synthetic fuel production unit that produces a synthetic compound and water from hydrogen and carbon dioxide; a cylindrical insulating layer disposed inside the cylinder of the synthetic fuel production unit; and a cylindrical water electrolysis unit disposed inside the cylinder of the insulating layer, which is cylindrical and has a water electrolysis cell in which an anode current collector layer, an anode gas diffusion layer, an anode catalyst layer, an electrolyte layer, a cathode catalyst layer, a cathode gas diffusion layer, and a cathode current collector layer are stacked radially, and which electrolyzes water to produce hydrogen and oxygen.

[0009] In the second embodiment of the synthetic fuel production apparatus, a water electrolysis unit is arranged inside the cylindrical synthetic fuel production unit with an insulating layer in between. Therefore, the reaction heat generated in the synthetic fuel production unit can be effectively supplied to the water electrolysis unit, and the operating temperature in the water electrolysis unit can be maintained.

[0010] The synthetic fuel production apparatus according to the third embodiment is a synthetic fuel production apparatus according to the first embodiment or the second embodiment, further comprising a heater for heating the synthetic fuel production section.

[0011] According to the synthetic fuel production apparatus of the third embodiment, the synthetic fuel production unit can be heated with a heater at startup.

[0012] The synthetic fuel production apparatus according to the fourth embodiment is the synthetic fuel production apparatus according to the first embodiment, wherein the water electrolysis cell is a proton exchange membrane type water electrolysis cell or an anion exchange membrane type water electrolysis cell.

[0013] In the fourth embodiment of the synthetic fuel production apparatus, the water electrolysis cell is a proton exchange membrane type water electrolysis cell or an anion exchange membrane type water electrolysis cell, and since the reaction temperature of the water electrolysis cell is lower than that of the synthetic fuel production unit, it is preferable to provide the synthetic fuel production unit on the inside of the cylinder of the water electrolysis unit.

[0014] The synthetic fuel production apparatus according to the fifth embodiment is the synthetic fuel production apparatus according to the second embodiment, wherein the water electrolysis cell is a solid oxide type water electrolysis cell.

[0015] In the fifth embodiment of the synthetic fuel production apparatus, the water electrolysis cell is a solid oxide type water electrolysis cell, and since the reaction temperature of the water electrolysis cell is higher than that of the synthetic fuel production unit, it is preferable that the water electrolysis unit be kept warm and that the water electrolysis unit be located inside the cylinder of the synthetic fuel production unit.

[0016] The synthetic fuel production apparatus according to the sixth embodiment supplies water produced in the synthetic fuel production unit to the water electrolysis unit, in the synthetic fuel production apparatus according to any of the first to fifth embodiments.

[0017] According to the synthetic fuel production apparatus of the sixth embodiment, the water produced in the synthetic fuel production section can be effectively utilized within the synthetic fuel production apparatus.

[0018] The seventh embodiment of the synthetic fuel production apparatus supplies hydrogen produced in the water electrolysis unit to the synthetic fuel production unit, in the synthetic fuel production apparatus according to any of the first to sixth embodiments.

[0019] According to the synthetic fuel production apparatus of the seventh embodiment, synthetic fuel can be produced within the synthetic fuel production apparatus using water and carbon dioxide as raw materials.

[0020] The synthetic fuel production device according to the eighth aspect is the synthetic fuel production device according to any one of the first to seventh aspects, wherein the production reaction of synthetic fuel in the synthetic fuel production unit is the Sabatier reaction.

[0021] According to the synthetic fuel production device according to the eighth aspect, methane can be produced as the synthetic fuel.

[0022] The synthetic fuel production device according to the ninth aspect is the synthetic fuel production device according to any one of the first to eighth aspects, wherein the operating voltage per one of the water electrolysis cells is not more than the thermal neutral potential.

[0023] According to the synthetic fuel production device according to the ninth aspect, heat generation does not occur in the water electrolysis unit, so the reaction heat generated in the synthetic fuel production unit can be effectively utilized.

[0024] The synthetic fuel production system according to the tenth aspect includes a plurality of synthetic fuel production devices according to any one of the first to ninth aspects.

[0025] According to the synthetic fuel production system according to the tenth aspect, for a plurality of synthetic fuel production devices, raw material supply and output of the produced synthetic fuel can be integrated.

[0026] The synthetic fuel production system according to the eleventh aspect is the synthetic fuel production system according to the tenth aspect, wherein the water generated in the synthetic fuel production unit of one of the synthetic fuel production devices is supplied to the water electrolysis unit of another synthetic fuel production device.

[0027] According to the synthetic fuel production system according to the eleventh aspect, the water generated in the synthetic fuel production unit can be effectively utilized among a plurality of synthetic fuel production devices.

[0028] The synthetic fuel production system according to the twelfth aspect is the synthetic fuel production system according to the tenth or eleventh aspect, wherein the hydrogen generated in the water electrolysis unit of one of the synthetic fuel production devices is supplied to the synthetic fuel production unit of another synthetic fuel production device.

[0029] According to the synthetic fuel production system of the 12th embodiment, synthetic fuel can be produced within the synthetic fuel production system using water and carbon dioxide as raw materials. [Effects of the Invention]

[0030] According to the present invention, it is possible to effectively utilize the heat generated in the synthetic fuel production section. [Brief explanation of the drawing]

[0031] [Figure 1] This is a configuration diagram showing a synthetic fuel production apparatus according to the first embodiment. [Figure 2] This is a configuration diagram showing a synthetic fuel production apparatus according to the second embodiment. [Figure 3] This is a diagram showing the configuration of a synthetic fuel production system according to the third embodiment. [Modes for carrying out the invention]

[0032] Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

[0033] <First Embodiment> Figure 1 shows a schematic diagram of the synthetic fuel production device 10A of this embodiment. The synthetic fuel production device 10A has a cylindrical shape and includes a water electrolysis unit 20 and a synthetic fuel production unit 32.

[0034] The water electrolysis unit 20 has a water electrolysis cell 20A that decomposes water into hydrogen and oxygen by the water electrolysis reaction shown in the following formula (1).

[0035] H2O → H2 + (1 / 2)O2(1)

[0036] The water electrolysis cell 20A is cylindrical, and the following layers are stacked from the radially outer side: an anode current collector layer 21, an anode gas diffusion layer 22, an anode catalyst layer 23, an electrolyte layer 24, a cathode catalyst layer 25, a cathode gas diffusion layer 26, and a cathode current collector layer 27. In this embodiment, an example of a single-layer water electrolysis cell 20A is described, but the water electrolysis unit 20 may be constructed by stacking multiple layers of water electrolysis cells 20A. As for the water electrolysis cell 20A, it is preferable to use a proton exchange membrane type water electrolysis cell or an anion exchange membrane type water electrolysis cell because the reaction temperature of the water electrolysis unit 20 is lower than that of the synthetic fuel production unit 32. A solid oxide type water electrolysis cell may also be used.

[0037] The electrolyte layer 24 has an anode catalyst layer 23 laminated on its radially outer side and a cathode catalyst layer 25 laminated on its radially inner side. An anode gas diffusion layer 22 is laminated on the outside of the anode catalyst layer 23, and an anode current collector layer 21 is laminated on the outside of the anode gas diffusion layer 22. An anode channel 21A is formed on the inner circumference side (anode gas diffusion layer 22 side) of the anode current collector layer 21. The anode channel 21A is formed as a fluid channel, such as a groove-like or uneven pattern.

[0038] A cathode gas diffusion layer 26 is laminated inside the cathode catalyst layer 25, and a cathode current collector layer 27 is laminated inside the cathode gas diffusion layer 26. A groove-shaped cathode channel 27A is formed on the outer circumference side (cathode gas diffusion layer 26 side) of the cathode current collector layer 27. The cathode channel 27A is formed as a fluid channel, such as a groove or uneven pattern. In this embodiment, the outer side of the electrolyte layer 24 is designated as the anode side and the inner side as the cathode side. However, the inner side of the electrolyte layer 24 may be designated as the anode side and the outer side as the cathode side.

[0039] An outer insulating layer 40 is laminated on the radially outer side of the water electrolysis unit 20 (anode current collector layer 21), and an inner insulating layer 42 is laminated on the radially inner side of the water electrolysis unit 20 (cathode current collector layer 27). The outer insulating layer 40 and the inner insulating layer 42 are made of non-conductive material and can be made of materials such as polytetrafluoroethylene resin (PTFE), polyetheretherketone resin (PEEK), polypropylene resin (PP), or polyetherimide resin (PEI).

[0040] A synthetic fuel generation unit 32 is located radially inside the inner insulating layer 42. The synthetic fuel generation unit 32 produces a synthetic compound and water using hydrogen and carbon dioxide. In this embodiment, an example of synthesizing methane as the synthetic compound by the Sabatier reaction will be described.

[0041] The synthetic fuel production unit 32 is cylindrical, and a reactor 32A is formed inside the cylinder. The reactor 32A contains catalyst A, and methane and water are produced by a methane synthesis reaction as shown in the following equation (2).

[0042] 4H2 + CO2 → CH4 + 2H2O (2)

[0043] A heater 44 is provided between the inner insulating layer 42 and the synthetic fuel production unit 32. The heater 44 can be constructed by spirally winding a heating wire around the outer circumference of the synthetic fuel production unit 32. Alternatively, the heater 44 may be constructed by placing a plate-shaped member on the outside of the synthetic fuel production unit 32. When the synthetic fuel production device 10A is started, the heater 44 heats the synthetic fuel production unit 32 to raise the temperature of the reactor 32A to the operating temperature.

[0044] A water supply passage 12 is connected to one end of the anode channel 21A of the water electrolysis unit 20 in the direction of the cylindrical axis, and water is supplied from the water supply passage 12 to the anode channel 21A. An oxygen discharge passage 13 is connected to the other end of the anode channel 21A in the direction of the cylindrical axis, and unreacted water and oxygen produced by water electrolysis are discharged from the oxygen discharge passage 13.

[0045] One end of the hydrogen delivery passage 14 is connected to the other end of the cathode channel 27A of the water electrolysis unit 20 in the direction of the cylindrical axis, and hydrogen produced by water electrolysis is delivered from the hydrogen delivery passage 14.

[0046] The other end of the hydrogen delivery passage 14 is connected to the other end in the cylindrical axis direction of the reactor 32A of the synthetic fuel production unit 32, and hydrogen is supplied from the hydrogen delivery passage 14 to the reactor 32A. A carbon dioxide supply passage 15 is connected to the other end in the cylindrical axis direction of the reactor 32A, and carbon dioxide is supplied from the carbon dioxide supply passage 15 to the reactor 32A. A synthetic fuel delivery passage 16 is connected to one end in the cylindrical axis direction of the reactor 32A, and methane and water produced in the synthetic fuel production unit 32 are delivered from the synthetic fuel delivery passage 16.

[0047] A condenser 17 is connected to the synthetic fuel delivery channel 16, where water is condensed. The condensed water is then joined with the water supply channel 12 via the condensation water channel 18. The methane from which the water has been removed is delivered from the methane delivery channel 19.

[0048] A voltage application unit 36 ​​is connected to the water electrolysis unit 20, which applies an operating voltage between the anode current collector layer 21 and the cathode current collector layer 27. The voltage application unit 36 ​​applies a voltage to the water electrolysis unit 20 such that the operating voltage per water electrolysis cell 20A is below the thermal neutral potential. The thermal neutral potential here is the potential at which no heat is generated in the water electrolysis unit 20.

[0049] Next, the operation and effects of the synthetic fuel production apparatus 10A of this embodiment will be described.

[0050] When water is supplied from the water supply path 12 to one end of the anode flow path 21A of the water electrolysis unit 20, and an operating voltage is applied from the voltage application unit 36 ​​between the anode current collector layer 21 and the cathode current collector layer 27, the following reaction (3) occurs on the surface of the anode catalyst layer 23.

[0051] H2O → 2H + + 0.5O2 + 2e - (3)

[0052] The oxygen diffuses in the anode gas diffusion layer 22 and flows toward the other end of the anode channel 21A, where it is discharged from the oxygen delivery channel 13 along with unreacted water.

[0053] Hydrogen proton H + The electrons e move towards the cathode side through the electrolyte layer 24 and are supplied by the external wiring. - The reaction (4) yields hydrogen, which is diffused in the cathode gas diffusion layer 26 and flows toward the other end of the cathode channel 27A, and is discharged from the hydrogen discharge channel 14.

[0054] 2H + + 2e - → H2(4)

[0055] Hydrogen discharged from the hydrogen discharge channel 14 is supplied to the other end of the reactor 32A of the synthetic fuel production unit 32, and carbon dioxide is supplied to the other end of the reactor 32A from the carbon dioxide supply channel 15.

[0056] In reactor 32A, methane and water are produced as synthetic compounds through the Sabatier reaction between hydrogen and carbon dioxide. The Sabatier reaction in reactor 32A is an exothermic reaction, and thermal energy is supplied from the synthetic fuel production unit 32 to the water electrolysis unit 20 via the inner insulating layer 42.

[0057] The methane and water produced in reactor 32A are sent from the synthetic fuel delivery channel 16 to the condenser 17, where the water is condensed. The condensed water is then joined with the water supply channel 12 via the condensation water channel 18 and supplied again to the water electrolysis unit 20. The methane from which the water has been removed is discharged from the methane delivery channel 19.

[0058] In the synthetic fuel production apparatus 10A of this embodiment, the synthetic fuel production unit 32 is located inside the cylindrical water electrolysis unit 20. Therefore, the reaction heat generated in the synthetic fuel production unit 32 can be effectively supplied to the water electrolysis unit 20, and the operating temperature in the water electrolysis unit 20 can be maintained.

[0059] Furthermore, since the synthetic fuel production device 10A of this embodiment is equipped with a heater 44, the synthetic fuel production unit 32 can be heated by the heater 44 when starting up.

[0060] Furthermore, in the synthetic fuel generation apparatus 10A of this embodiment, the water produced in the synthetic fuel generation unit 32 is supplied to the water electrolysis unit 20, so the water produced in the synthetic fuel generation unit 32 can be effectively utilized within the synthetic fuel generation apparatus 10A.

[0061] Furthermore, in the synthetic fuel generation apparatus 10A of this embodiment, hydrogen produced in the water electrolysis unit 20 is supplied to the synthetic fuel generation unit 32, so synthetic fuel can be produced using water and carbon dioxide as raw materials without the need to supply hydrogen from outside the synthetic fuel generation apparatus 10A.

[0062] <Second Embodiment> Next, a second embodiment will be described. In this embodiment, the same reference numerals are used for parts that are the same as in the first embodiment, and their detailed descriptions are omitted.

[0063] As shown in Figure 2, the synthetic fuel production apparatus 10B of this embodiment is cylindrical in shape, with a water electrolysis unit 50 located radially inward, and a synthetic fuel production unit 62 located outside the water electrolysis unit 50 via an inner insulating layer 46.

[0064] The water electrolysis unit 50 has a water electrolysis cell 50A. In this embodiment, the water electrolysis cell 50A has the inner and outer layers of each layer in the radial direction reversed compared to the water electrolysis cell 20A of the first embodiment, and is cylindrical in shape. From the radial inside out, the anode current collector layer 51, anode gas diffusion layer 52, anode catalyst layer 53, electrolyte layer 54, cathode catalyst layer 55, cathode gas diffusion layer 56, and cathode current collector layer 57 are stacked. In this embodiment, an example of a single layer of water electrolysis cell 50A is described, but the water electrolysis unit 50 may be constructed by stacking multiple layers of water electrolysis cell 50A. As for the water electrolysis cell 50A, it is preferable to use a solid oxide type water electrolysis cell because the reaction temperature of the water electrolysis unit 50 is higher than that of the synthetic fuel production unit 62. It may also be a proton exchange membrane type water electrolysis cell or anion exchange membrane type water electrolysis cell.

[0065] An anode channel 51A is formed on the outer periphery side (anode gas diffusion layer 52 side) of the anode current collector layer 51. The anode channel 51A is formed as a fluid channel, such as a groove-like or uneven pattern.

[0066] A groove-shaped cathode channel 57A is formed on the inner circumference side (cathode gas diffusion layer 56 side) of the cathode current collector layer 57. The cathode channel 57A is formed as a fluid channel, such as a groove or uneven pattern. In this embodiment, the inner side of the electrolyte layer 54 is designated as the anode side and the outer side as the cathode side. However, the outer side of the electrolyte layer 54 may be designated as the anode side and the inner side as the cathode side.

[0067] An inner insulating layer 46 is laminated on the radially outer side of the water electrolysis unit 50 (cathode current collector layer 57). Alternatively, an insulating core may be provided on the radially inner side of the water electrolysis unit 50 (anode current collector layer 51).

[0068] A synthetic fuel production section 62 is located radially outside the inner insulating layer 46. The synthetic fuel production section 62 is cylindrical, and a cylindrical reactor 62A is formed inside it. The reactor 62A contains a catalyst A.

[0069] A heater 44 is provided on the radially outer side of the synthetic fuel generation unit 62, and an outer insulating layer 48 is provided on the radially outer side of the heater 44.

[0070] A water supply passage 12 is connected to one end of the anode channel 51A of the water electrolysis unit 50 in the direction of the cylindrical axis, and water is supplied from the water supply passage 12 to the anode channel 51A. An oxygen discharge passage 13 is connected to the other end of the anode channel 51A in the direction of the cylindrical axis, and unreacted water and oxygen produced by water electrolysis are discharged from the oxygen discharge passage 13.

[0071] One end of the hydrogen delivery passage 14 is connected to the other end of the cathode channel 57A of the water electrolysis unit 50 in the direction of the cylindrical axis, and hydrogen produced by water electrolysis is delivered from the hydrogen delivery passage 14.

[0072] The other end of the hydrogen delivery passage 14 is connected to the other end in the cylindrical axis direction of the reactor 62A of the synthetic fuel production unit 62, and hydrogen is supplied from the hydrogen delivery passage 14 to the reactor 62A. A carbon dioxide supply passage 15 is connected to the other end in the cylindrical axis direction of the reactor 62A, and carbon dioxide is supplied from the carbon dioxide supply passage 15 to the reactor 62A. A synthetic fuel delivery passage 16 is connected to one end in the cylindrical axis direction of the reactor 62A, and methane and water produced in the synthetic fuel production unit 62 are delivered from the synthetic fuel delivery passage 16.

[0073] The synthetic fuel generator 10B, like the first embodiment, includes a condenser 17, a water supply channel 12, and a methane delivery channel 19, and a voltage application unit 36 ​​that applies an operating voltage between the anode current collector layer 51 and the cathode current collector layer 57 is connected. The condenser 17 is connected to the synthetic fuel delivery channel 16, where water is condensed. The condensed water is joined to the water supply channel 12 via the condensation water channel 18. The methane from which the water has been removed is delivered from the methane delivery channel 19.

[0074] In this embodiment, as in the first embodiment, hydrogen and oxygen are produced by water electrolysis in the water electrolysis unit 50, and methane and water are produced by the Sabatier reaction in the synthetic fuel production unit 62 using the produced hydrogen and carbon dioxide as raw materials.

[0075] In the synthetic fuel production apparatus 10B of this embodiment, the synthetic fuel production unit 62 is located on the outside of the cylindrical water electrolysis unit 50. Therefore, the reaction heat generated in the synthetic fuel production unit 62 can be effectively supplied to the water electrolysis unit 50, and the operating temperature in the water electrolysis unit 50 can be maintained.

[0076] Furthermore, the synthetic fuel generation apparatus 10B of this embodiment is equipped with a heater 44, which supplies water produced in the synthetic fuel generation unit 62 to the water electrolysis unit 50, and supplies hydrogen produced in the water electrolysis unit 50 to the synthetic fuel generation unit 62, thus achieving the same effects as in the first embodiment.

[0077] In the first and second embodiments described above, examples were given in which methane and water are produced in the synthetic fuel production units 32 and 62 using hydrogen and carbon dioxide as raw materials via the Sabatier reaction. However, the synthetic fuel production units 32 and 62 may also use reactions to produce other synthetic fuels using hydrogen and carbon dioxide as raw materials. For example, a reverse shift reaction to produce carbon monoxide and water, a reaction to produce ethylene and water, a reaction to produce methanol and water, and furthermore, (CH2) n This can be described as a reaction that produces e-fuel and water, represented by [formula].

[0078] <Third Embodiment> Next, a third embodiment will be described. In this embodiment, a synthetic fuel production system 11 using multiple synthetic fuel production devices 10A of the first embodiment will be described.

[0079] As shown in Figure 3, the synthetic fuel production system 11 is equipped with multiple synthetic fuel production devices 10A. A common condenser 17 is provided, and the synthetic fuel delivery passages 16 from each synthetic fuel production device 10A are connected to the condenser 17. In addition, the condensate water passage 18 that delivers condensed water from the condenser 17 is connected to the water supply passage 12 that supplies water to each synthetic fuel production device 10A.

[0080] The synthetic fuel production system 11 is equipped with a hydrogen storage section 70. The hydrogen storage section 70 is located in the middle of the hydrogen delivery path 14 from each synthetic fuel production device 10A. The portion connected to the cathode flow path 27A of the water electrolysis section 20 of each synthetic fuel production device 10A is referred to as the hydrogen recovery path 14A, and the portion connected to the reactor 32A of each synthetic fuel production device 10A is referred to as the hydrogen supply path 14B.

[0081] In the synthetic fuel production system 11 of this embodiment, since multiple synthetic fuel production devices 10A are used, the hydrogen produced in each water electrolysis unit 20 can be supplied to the synthetic fuel production unit 32 of the other synthetic fuel production devices 10A.

[0082] Furthermore, there is no need to provide a separate condenser 17 for each unit; it can be shared, reducing the number of parts.

[0083] Although the above description mentions a synthetic fuel production system 11 using multiple synthetic fuel production devices 10A, multiple synthetic fuel production devices 10B may be used instead of synthetic fuel production devices 10A. [Explanation of Symbols]

[0084] 10A, 10B Synthetic fuel generation device 11. Synthetic fuel production system 20, 50 Water electrolysis section 21, 51 Anode current collector layer 22, 52 Anode gas diffusion layer 23, 53 Anode catalyst layer 24, 54 electrolyte layer 25, 55 Cathode catalyst layer 26, 56 Cathode gas diffusion layer 27, 57 Cathode current collector layer 32, 62 Synthetic fuel generation section 42, 46 Inner insulating layer (insulating layer) 44 Heater

Claims

1. A water electrolysis cell has an anode current collector layer, an anode gas diffusion layer, an anode catalyst layer, an electrolyte layer, a cathode catalyst layer, a cathode gas diffusion layer, and a cathode current collector layer stacked radially, and a cylindrical water electrolysis section that electrolyzes water to produce hydrogen and oxygen, A cylindrical insulating layer is disposed on the inside of the cylinder of the water electrolysis unit, A synthetic fuel generation unit is arranged inside the cylinder of the insulating layer, which generates a synthetic compound and water using hydrogen and carbon dioxide. A synthetic fuel production device equipped with the following features.

2. A cylindrical synthetic fuel production unit that generates synthetic compounds and water using hydrogen and carbon dioxide, A cylindrical insulating layer is disposed on the inside of the cylinder of the synthetic fuel generation section, The water electrolysis cell is arranged inside the cylindrical part of the insulating layer and is cylindrical in shape, with an anode current collector layer, an anode gas diffusion layer, an anode catalyst layer, an electrolyte layer, a cathode catalyst layer, a cathode gas diffusion layer, and a cathode current collector layer stacked radially, and has a cylindrical water electrolysis section that electrolyzes water to produce hydrogen and oxygen, A synthetic fuel production device equipped with the following features.

3. The synthetic fuel production apparatus according to claim 1 or claim 2, further comprising a heater for heating the synthetic fuel production section.

4. The synthetic fuel production apparatus according to claim 1, wherein the water electrolysis cell is a proton exchange membrane type water electrolysis cell or an anion exchange membrane type water electrolysis cell.

5. The synthetic fuel production apparatus according to claim 2, wherein the water electrolysis cell is a solid oxide type water electrolysis cell.

6. The synthetic fuel production apparatus according to claim 1 or claim 2, wherein the water produced in the synthetic fuel production unit is supplied to the water electrolysis unit.

7. The synthetic fuel production apparatus according to claim 1 or claim 2, wherein hydrogen produced in the water electrolysis unit is supplied to the synthetic fuel production unit.

8. The synthetic fuel production apparatus according to claim 1 or claim 2, wherein the synthetic fuel production reaction in the synthetic fuel production section is a Sabatier reaction.

9. The synthetic fuel production apparatus according to claim 1 or claim 2, wherein the operating voltage per water electrolysis cell is below the thermal neutral potential.

10. A synthetic fuel production system comprising a plurality of the synthetic fuel production devices described in claim 1 or claim 2.

11. The synthetic fuel production system according to claim 10, wherein water produced in the synthetic fuel production section of one synthetic fuel production device is supplied to the water electrolysis section of another synthetic fuel production device.

12. The synthetic fuel production system according to claim 10, wherein hydrogen produced in the water electrolysis section of one synthetic fuel production device is supplied to the synthetic fuel production section of another synthetic fuel production device.

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