JP5328226B2 - Solid oxide fuel cell - Google Patents

Description

  The present invention relates to a solid oxide fuel cell.

  Conventionally, there has been known a solid oxide fuel cell (hereinafter referred to as SOFC) in which a ceramic solid electrolyte is used as an electrolyte of a fuel cell and a cell is formed by sandwiching the solid electrolyte membrane between a fuel electrode and an air electrode from both sides. It has been. This SOFC has a higher output density and higher power generation efficiency than solid polymer fuel cells such as direct methanol fuel cells. In addition to hydrogen gas, all hydrocarbons such as carbon monoxide and methane can be used as they are as fuel gas. Furthermore, since the operating temperature is as high as about 1000 ° C., there is an advantage that an expensive catalyst such as Pt (platinum) is not required for the reaction.

When this SOFC is applied to a stationary fuel cell system, the mainstream is to use HC gas fuel such as natural gas because of easy fuel supply.
In recent years, application of SOFC to a fuel cell system of a moving body such as a fuel cell vehicle or a portable electronic device has been studied. In this case, it is difficult to use HC gas fuel as the fuel. Since the density of HC gas fuel is low, the portability in a high density state is poor. Along with this, it is necessary to secure a large volume of the fuel tank that stores the HC gas fuel, and the mountability to the moving body is poor. Furthermore, it is necessary to improve the supply infrastructure for HC gas fuel.

Therefore, the use of hydrocarbon-based liquid fuels (HC liquid fuels) such as gasoline and diesel fuel, which are higher in density than HC gas fuels and have a sufficient supply infrastructure, is being studied as SOFC fuels. In this case, a configuration (first prior art) is known in which nitrogen or carbon dioxide is supplied (bubbled) into the HC liquid fuel, HC gas fuel evaporated together with the nitrogen and carbon dioxide is taken out, and supplied to the SOFC. Further, as shown in Patent Document 1, a vaporized HC gas comprising a fuel vaporizer that vaporizes HC liquid fuel injected from an injector and a reformer that generates a fuel gas containing hydrogen from the HC liquid fuel. A configuration for supplying fuel to the SOFC (second prior art) is known.
JP 2002-246047 A

However, in the former case (first prior art), the fuel gas supplied to the SOFC is a mixed gas of HC gas fuel evaporated from the HC liquid fuel and nitrogen, carbon dioxide, or the like. It is low and it is difficult to secure SOFC output.
In the latter case (second prior art), the reformer itself causes an increase in weight, volume, and cost.

  Furthermore, in these prior arts, the HC gas fuel stays in the carbon deposition temperature region of about 500 ° C. during the movement to the electrode of about 1000 ° C. for a long time. As a result, carbon is deposited on the supply pipe of the HC gas fuel and the SOFC electrode. When carbon is deposited on the supply pipe, the supply pipe is clogged, and when it is deposited on the SOFC electrode, the activity of the catalyst is lost and the SOFC deteriorates.

  Accordingly, it is an object of the present invention to provide a solid oxide fuel cell that can achieve high output and low cost while using liquid fuel, and can suppress carbon deposition.

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to supplying an oxidant gas to one electrode of a power generator (eg, power generator 40 in the embodiment) of a solid oxide fuel cell, and the one electrode A first reaction chamber (for example, the first reaction chamber 25 in the embodiment) in which the oxidant gas is reacted, and an oxidant gas discharge path (for example, in the embodiment) that discharges the exhaust gas of the oxidant gas from the first reaction chamber. A second reaction chamber (e.g., an embodiment) in which fuel gas is supplied to the oxidant gas discharge passage 28) and the other electrode of the power generator of the solid oxide fuel cell, and the fuel gas is reacted at the other electrode. A solid oxide fuel cell comprising a second reaction chamber 35) and a fuel gas discharge passage for discharging the fuel gas exhaust gas from the second reaction chamber (for example, the fuel gas discharge passage 38 in the embodiment) Example In the solid oxide fuel cell 10) in the embodiment, the injector (for example, the injector 32 in the embodiment) that injects liquid fuel into the second reaction chamber, and the injector chamber (for example, the injector chamber in which the injector is accommodated) An injector chamber 33) in the embodiment, and a shield provided with a through hole (for example, the through hole 14a in the embodiment) that partitions the injector chamber and the second reaction chamber and through which the liquid fuel injected from the injector passes. A plate (for example, the shielding plate 14 in the embodiment), a cooling means capable of cooling the shielding plate, and the liquid fuel injected into the second reaction chamber until the liquid fuel reaches the other electrode. Vaporization means for vaporizing the fuel gas (for example, the heating means 12 in the embodiment) is provided.

  The invention according to claim 2 is the solid oxide fuel cell according to claim 1, wherein the flow path changing plate changes the flow direction of the fuel gas in the second reaction chamber to the second reaction chamber. (For example, the flow path changing plate 36 in the embodiment) is provided.

  The invention according to claim 3 is the solid oxide fuel cell according to claim 1 or 2, wherein the liquid fuel is directly injected into the second electrode into the second reaction chamber. A protective plate for prevention (for example, the protective plate 42 in the embodiment) is provided.

  The invention according to claim 4 is the solid oxide fuel cell according to claim 1, wherein as the vaporizing means, microwave application is performed to apply microwave to the liquid fuel injected into the second reaction chamber. Means (for example, the microwave application means 50 in the embodiment), and the shielding plate is provided with microwave leakage prevention means for preventing leakage of the microwave into the injector chamber.

According to the first aspect of the invention, it is possible to vaporize the liquid fuel injected from the injector in the second reaction chamber and supply the fuel gas to the power generator. This makes it possible to supply a high-concentration fuel gas to the power generator as compared with the case where fuel gas vaporized by bubbling or the like is supplied, and the output of the fuel cell can be improved. In addition, since no reformer or the like is used, the weight, volume, and cost of the fuel cell system can be reduced. Furthermore, since the liquid fuel is vaporized for the first time in the second reaction chamber, carbon deposition can be suppressed.
Accordingly, liquid fuel can be used for the solid oxide fuel cell. Liquid fuel is excellent in portability in a high density state. In addition, hydrocarbon-based liquid fuels such as gasoline and diesel fuel are well equipped. Therefore, a solid oxide fuel cell can be adopted for a mobile body such as a fuel cell vehicle or a portable electronic device.

  According to the invention which concerns on Claim 2, it becomes possible to increase the contact opportunity of fuel gas and an electric power generation body, and can improve the utilization efficiency of a fuel.

  According to the invention which concerns on Claim 3, it can prevent that an electric power generation body is damaged by the impact and heat shock by a collision with liquid fuel.

  According to the invention which concerns on Claim 4, liquid fuel can be reliably vaporized in a predetermined position, and fuel gas can be supplied to an electric power generation body. Further, it is possible to prevent the liquid fuel from being vaporized in the injector chamber, and the fuel utilization efficiency can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a schematic configuration diagram of the solid oxide fuel cell according to the first embodiment. The solid oxide fuel cell 10 of the present embodiment mainly includes an oxidant flow system 20 having a first reaction chamber 25, a fuel flow system 30 having a second reaction chamber 35, a first reaction chamber 25, and the like. The power generation body 40 disposed between the second reaction chamber 35 and the heating means 12 for heating the power generation body 40 are provided.

  The oxidant flow system 20 includes a first reaction chamber 25 made of a heat resistant material. The first reaction chamber 25 is formed, for example, in a cylindrical shape, one end portion (upper end portion in FIG. 1) is closed, and the power generator 40 is disposed at the other end portion (lower end portion in FIG. 1). An oxidant gas supply path 22 is connected to the first reaction chamber 25 in order to supply the oxidant gas to the power generation body 40. In addition, an oxidant gas discharge path 28 is connected to the first reaction chamber 25 in order to discharge used oxidant gas and unused oxidant gas in the power generation body 40.

  The fuel flow system 30 includes a second reaction chamber 35 made of a heat resistant material. The second reaction chamber 35 is formed in, for example, a cylindrical shape, and an injector chamber 33 described later is connected to one end portion (lower end portion in FIG. 1), and the power generator 40 is connected to the other end portion (upper end portion in FIG. 1). Is arranged. A fuel gas discharge path 38 is connected to the second reaction chamber 35 in order to discharge used fuel gas and unused fuel gas in the power generation body 40. An exhaust cutoff valve 39 may be provided in the fuel gas discharge path 38.

The power generation body 40 includes a solid electrolyte membrane, an air electrode disposed on the first reaction chamber 25 side of the solid electrolyte membrane, and a fuel electrode disposed on the second reaction chamber 35 side of the solid electrolyte membrane. . The solid electrolyte membrane is made of a material such as YSZ (Yttria Stabilized Zirconia). The air electrode is composed of, for example, a sintered body of gadolinium-based material and YSZ, and the fuel electrode is composed of, for example, a sintered body of nickel and YSZ. The oxidant gas supplied to the air electrode becomes oxygen ions by a catalytic reaction, passes through the solid electrolyte membrane, moves to the fuel electrode, and is combined with the fuel gas. Electricity is generated during this reaction process.
The operating temperature of the solid oxide fuel cell is about 1000 ° C. Therefore, a heating means 12 for heating the power generator 40 is provided. As the heating means 12, for example, a heating furnace that houses the first reaction chamber 25 and the second reaction chamber 35 is provided.

  An injector chamber 33 is connected to the second reaction chamber 35 via a shielding plate 14. A through hole 14 a that communicates the second reaction chamber 35 and the injector chamber 33 is provided at the center of the shielding plate 14. An injector 32 is provided at the bottom of the injector chamber 33. The injector 32 can inject the liquid fuel supplied from the liquid fuel tank 31 into the injector chamber 33.

  By the way, when the injector 32 is heated by the heating means 12 described above, carbon contained in the liquid fuel may be deposited and the injector may be clogged. Therefore, in order to suppress heat transfer from the heating unit 12 to the injector 32, the shielding plate 14 is cooled by a cooling unit (not shown). As the cooling means, for example, a refrigerant circulation mechanism that circulates the refrigerant inside the shielding plate 14 can be adopted.

  The injector 32 injects liquid fuel from the bottom of the injector chamber 33 through the injector chamber 33, the through hole 14 a of the shielding plate 14, and the second reaction chamber 35 toward the upper power generator 40. The liquid fuel injected from the injector 32 first proceeds through L1 (liquid column section) in a liquid column state. Next, when the liquid column is heated by the heating means 12, the low vapor pressure component contained in the liquid fuel boils and splits into countless droplets. And it advances L2 (droplet section) in a droplet state. Next, when the droplets are heated by the heating means 12, the droplets are vaporized and fuel gas is generated. Then, the gas travels through L3 (gas section) in a gas state and reaches the power generation body 40. Such vaporization of the liquid fuel is realized by heating the liquid fuel by the heating means 12. That is, the heating means 12 functions as a liquid fuel vaporization means.

  By the way, if the shielding plate 14 exists in the droplet section L2, the droplet may collide with the shielding plate 14. In this case, since the fuel is not supplied to the power generation body 40, the fuel utilization efficiency is lowered. Therefore, it is desirable to make the length of the liquid column section L1 longer than the distance from the injector 32 to the shielding plate 14. The length of the liquid column section L1 is adjusted by adjusting the gas temperature and gas pressure in the injector chamber 33 and the second reaction chamber 35, the temperature and viscosity of the liquid fuel, the gas-liquid surface tension, the injection pressure and the nozzle hole diameter of the injector 32, and the like. Can be performed. For example, the length of the liquid column section L1 can be increased as the gas pressure in the injector chamber 33 and the second reaction chamber 35 is decreased and the injection pressure of the injector 32 is decreased.

  On the other hand, when the droplet section L2 extends to the power generation body 40, the power generation body 40 may be damaged due to an impact caused by a collision with the droplet or a heat shock. Conversely, when the end point of the droplet section L2 is far from the power generation body 40 (when the gas section L3 becomes longer), the fuel gas diffuses, so the concentration of fuel gas supplied to the power generation body 40 decreases. Therefore, it is desirable to dispose the end point of the droplet section L2 near the power generator 40 (shorten the gas section L3). The end point position of the droplet section L2 can be adjusted by controlling the droplet evaporation rate. For example, the higher the gas temperature or the liquid fuel temperature in the second reaction chamber 35 is, the faster the droplet evaporation speed becomes, and the end point position of the droplet section L2 moves away from the power generator 40. Conversely, the higher the gas pressure in the second reaction chamber 35 or the larger the nozzle hole diameter of the injector 32, the slower the droplet evaporation rate, and the end point position of the droplet section L2 approaches the power generator 40. In addition, compared with the case where the gas-liquid interface is smooth, the equilibrium vapor pressure is higher in the droplet, and the evaporation speed is faster as the droplet radius is smaller.

  In addition, it is desirable that the shielding plate 14 provided with the cooling means is configured to be able to approach and separate from the power generation body 40. Thereby, the gas temperature in the second reaction chamber 35 can be adjusted, and the droplet evaporation speed and the end point position of the droplet section L2 can be controlled. In addition, the temperature of the power generation body 40 can be controlled.

(Modification)
FIG. 2 is a schematic configuration diagram of a modified example of the solid oxide fuel cell according to the present embodiment. In the following drawings, the description of the oxidant gas supply path, the oxidant gas discharge path, the fuel gas discharge path, the heating means, the liquid fuel tank, etc. is omitted in order to simplify the drawing and facilitate understanding. . In this modification, a flow path changing plate 36 is provided in the second reaction chamber 35. The flow path changing plate 36 is provided on the entire circumference of the second reaction chamber 35, and extends from the side wall of the second reaction chamber 35 toward the center. A through hole is provided in the central portion of the flow path changing plate 36 in order to distribute the fuel injected from the injector 32.

  The liquid fuel injected from the injector 32 is supplied to the power generation body 40 as fuel gas in the second reaction chamber 35. The fuel gas flows from the central portion of the power generator 40 toward the peripheral portion, and further flows down along the side wall of the second reaction chamber 35. The flow path changing plate 36 changes the flow direction of the fuel gas along the side wall of the second reaction chamber 35 toward the central portion of the power generation body 40. Therefore, the flow path changing plate 36 is formed upward (so as to approach the power generation body 40) from the side wall to the center of the second reaction chamber 35.

  By providing the flow path changing plate 36, convection of the fuel gas is generated inside the second reaction chamber 35, and the chance of contact between the fuel gas and the power generator 40 increases. Therefore, the fuel gas that has not been consumed in the first contact with the power generation body 40 can be consumed in the second and subsequent contacts. Thereby, the utilization efficiency of fuel can be improved.

As described above in detail, the solid oxide fuel cell according to the first embodiment shown in FIG. 1 includes an injector 32 that injects liquid fuel into the second reaction chamber 35 and an injector chamber in which the injector 32 is housed. 33, the shielding plate 14 that partitions the injector chamber 33 and the second reaction chamber 35, cooling means that can cool the shielding plate 14, and liquid fuel injected into the second reaction chamber 35 until the power generator 40 is reached. And heating means 12 for vaporizing the fuel gas.
According to this configuration, the liquid fuel injected from the injector 32 can be vaporized in the second reaction chamber 35 and the fuel gas can be supplied to the power generator 40. Thereby, compared with the case where the fuel gas vaporized by bubbling etc. is supplied, it becomes possible to supply the fuel gas of high concentration to the power generation body 40, and the output of the fuel cell can be improved. Moreover, since a reformer or the like is not used, the weight, volume, and cost of the fuel cell can be reduced. Furthermore, since the liquid fuel is vaporized for the first time in the second reaction chamber, it is possible to limit the region in which carbon is deposited to the second reaction chamber. Also in the second reaction chamber, the residence time in the fuel gas state is shortened, so that carbon deposition can be suppressed.

  Accordingly, liquid fuel can be used for the solid oxide fuel cell. Liquid fuel is excellent in portability in a high density state. In addition, hydrocarbon-based liquid fuels such as gasoline and diesel fuel are well equipped. Therefore, a solid oxide fuel cell can be employed for a moving body such as a fuel cell vehicle or a portable electronic device.

(Second Embodiment)
FIG. 3 is a schematic configuration diagram of a solid oxide fuel cell according to the second embodiment. The second embodiment is different from the first embodiment in that a protection plate 42 is provided in place of the power generator at the collision position of the liquid fuel in the second reaction chamber 35. Note that the description of the same configuration as in the first embodiment is omitted.

If a part of the liquid fuel injected from the injector 32 collides with the power generation body in a droplet state, the power generation body may be damaged by the impact or heat shock. Therefore, in the present embodiment, the protective plate 42 is provided at the liquid fuel collision position. Specifically, the central portion of the power generation body 40 is cut out, and a protective plate 42 made of a heat resistant material is provided in the central portion.
Even if a part of the liquid fuel injected from the injector 32 collides with the protective plate 42 in a droplet state, the protective plate 42 made of a heat-resistant material is not damaged. The collided droplets are vaporized to become fuel gas, and this fuel gas flows toward the power generation body 40 at the peripheral portion, so that the power generation body 40 can generate power.

(First modification)
FIG. 4 is a schematic configuration diagram of a first modification of the second embodiment. In this first modification, the end surface 35a of the second reaction chamber 35 functions as a protective plate. In addition, the 1st reaction chamber 25 is connected to the side wall of the 2nd reaction chamber 35, and the electric power generation body 40 is arrange | positioned between both.
Even if a part of the liquid fuel injected from the injector 32 collides with the end surface 35a of the second reaction chamber 35 in a droplet state, the end surface 35a of the second reaction chamber 35 made of a heat-resistant material is not damaged. . The collided droplets are vaporized to become fuel gas, flow from the central portion of the end surface 35a toward the peripheral portion, and further flow down along the side wall of the second reaction chamber 35. Thereby, the fuel gas can be supplied to the power generation body 40 arranged on the side wall of the second reaction chamber 35.

(Second modification)
FIG. 5 is a schematic configuration diagram of a second modification of the second embodiment. In the second modification, the liquid fuel is injected from the injector 32 toward the end surface 35a so as to intersect with the normal V of the end surface 35a of the second reaction chamber 35 (at an intersecting angle φ). The incident direction of the liquid fuel is opposite to the position of the power generator 40 across the droplet collision point P on the end surface 35a. The other configuration is the same as that of the first modification described above.
When a part of the liquid fuel injected from the injector 32 collides with the end surface 35a of the second reaction chamber 35 in a droplet state, the droplet is vaporized and becomes a fuel gas. This fuel gas flows in the direction opposite to the direction of incidence of the liquid droplets across the collision point P of the liquid droplets on the end surface 35a. Since the power generation body 40 is disposed on the side wall of the second reaction chamber 35 in that direction, the fuel gas can be supplied to the power generation body 40.

  In this second modification, the liquid fuel is injected toward the end surface 35a of the second reaction chamber 35. However, as indicated by the arrow 18 in FIG. 5, the liquid fuel is injected toward the side wall of the second reaction chamber 35. Also good. In this case, the liquid fuel is injected from the injector 32 so as to intersect the normal line of the side wall of the second reaction chamber 35. The incident direction of the droplet is set in the direction opposite to the position of the power generator 40 with the central axis of the second reaction chamber 35 interposed therebetween.

(Third Modification)
FIG. 6 is a schematic configuration diagram of a third modification of the second embodiment. In the third modification, the power generator 40 is disposed on the end surface 35 a of the second reaction chamber 35. That is, the first reaction chamber 25 is connected to the end surface 35a of the second reaction chamber 35, and the power generator 40 is disposed between the two. Other configurations are the same as those of the second modification described above.
When a part of the liquid fuel injected from the injector 32 collides with the end surface 35a of the second reaction chamber 35 in a droplet state, the droplet is vaporized and becomes a fuel gas. This fuel gas flows in the direction opposite to the direction of incidence of the liquid droplets across the collision point P of the liquid droplets on the end surface 35a. In that direction, since the power generation body 40 is disposed on the same end surface 35a, the fuel gas can be supplied to the power generation body 40.

  As described in detail above, the solid oxide fuel cell according to the second embodiment shown in FIG. 3 is provided with a protective plate that prevents liquid fuel from being directly injected into the power generator. According to this configuration, it is possible to prevent the power generator from being damaged by an impact or a heat shock caused by a collision with the liquid fuel.

(Third embodiment)
FIG. 7 is a schematic configuration diagram of a solid oxide fuel cell according to a third embodiment. The third embodiment is different from the first embodiment in that a microwave application unit 50 is provided as a liquid fuel vaporization unit. Note that detailed description of portions having the same configuration as in the first embodiment is omitted.

  The microwave application means 50 includes a microwave generation source 51 disposed outside the second reaction chamber 35, an irradiation antenna 54 disposed toward the inside of the second reaction chamber 35, and a coaxial cable connecting the two. 52. In the microwave application means 50, the microwave generated by the microwave generation source 51 can be applied from the irradiation antenna 54 toward the inside of the second reaction chamber 35. The flow path changing plate 36 is made of a ceramic material that transmits microwaves.

  In the present embodiment, a liquid fuel mixed with ethanol or the like, which is a high dielectric constant material, is injected from the injector 32. Then, for example, the microwave 56 of 2.45 GHz is applied so that the microwave intensity is maximized at a predetermined position where the liquid fuel is to be vaporized. Then, the high dielectric constant material mixed in the liquid fuel boils instantaneously, and the liquid fuel can be divided into fine droplets. Since the divided fine droplets are vaporized without delay, the liquid fuel can be vaporized into fuel gas at a predetermined position.

  Note that when the microwave irradiated to the second reaction chamber 35 leaks into the injector chamber 33, the liquid fuel is vaporized in the injector chamber 33, so that the fuel gas cannot be supplied to the power generator 40. Therefore, it is desirable that the shielding plate 14 disposed between the second reaction chamber 35 and the injector chamber 33 has a microwave blocking function. Specifically, the diameter of the through-hole 14a of the shielding plate 14 is set to be equal to or less than the attenuation diameter of the microwave, or the thickness of the shielding plate 14 is increased while the diameter of the through-hole 14a is set to be equal to or less than the wavelength of the microwave. It is conceivable to attenuate or arrange a mesh attenuation structure inside the through hole 14a.

As described in detail above, the solid oxide fuel cell according to the present embodiment includes the microwave application unit 50 that applies a microwave to the liquid fuel injected into the second reaction chamber 35 as a liquid fuel vaporization unit. The shielding plate 14 is provided with microwave leakage prevention means for preventing the microwave from leaking into the injector chamber 33.
Thereby, the liquid fuel can be reliably vaporized at a predetermined position, and the fuel gas can be supplied to the power generation body 40. Further, it is possible to prevent the liquid fuel from being vaporized in the injector chamber 33, and the fuel utilization efficiency can be improved.

It should be noted that the technical scope of the present invention is not limited to the above-described embodiments, and includes those in which various modifications are made to the above-described embodiments without departing from the spirit of the present invention. In other words, the configuration described in the above-described embodiment is merely an example, and can be changed as appropriate.
For example, the materials such as the oxidant gas, the fuel gas, and the power generator 40 are not limited to those described in the embodiment, and various materials can be employed.

It is a schematic block diagram of the solid oxide fuel cell of 1st Embodiment. It is a schematic block diagram of the modification of 1st Embodiment. It is a schematic block diagram of the solid oxide fuel cell of 2nd Embodiment. It is a schematic block diagram of the 1st modification of 2nd Embodiment. It is a schematic block diagram of the 2nd modification of 2nd Embodiment. It is a schematic block diagram of the 3rd modification of 2nd Embodiment. It is a schematic block diagram of the solid oxide fuel cell of 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Solid oxide fuel cell 12 ... Heating means (vaporization means) 14 ... Shielding plate 14a ... Through-hole 25 ... 1st reaction chamber 28 ... Oxidant gas discharge path 32 ... Injector 33 ... Injector chamber 35 ... 2nd reaction chamber 36 ... Flow path changing plate 38 ... Fuel gas discharge passage 40 ... Power generator 42 ... Protection plate 50 ... Microwave application means (vaporization means)

Claims (4)

A first reaction chamber for supplying an oxidant gas to one electrode of a power generation body of a solid oxide fuel cell and reacting the oxidant gas at the one electrode, and the oxidant gas from the first reaction chamber An oxidant gas discharge path for discharging exhaust gas;
A second reaction chamber for supplying fuel gas to the other electrode of the power generator of the solid oxide fuel cell and causing the fuel gas to react at the other electrode; and an exhaust gas of the fuel gas from the second reaction chamber A fuel gas discharge path for discharging
A solid oxide fuel cell comprising:
An injector for injecting liquid fuel into the second reaction chamber; an injector chamber in which the injector is housed;
A partition plate that partitions the injector chamber and the second reaction chamber and includes a through-hole through which the liquid fuel injected from the injector passes;
Cooling means capable of cooling the shielding plate;
A solid oxide fuel cell comprising vaporization means for vaporizing the liquid fuel into a fuel gas before the liquid fuel injected into the second reaction chamber reaches the other electrode. The solid oxide fuel cell according to claim 1,
A solid oxide fuel cell, wherein a flow path changing plate for changing a flow direction of the fuel gas in the second reaction chamber is provided in the second reaction chamber. The solid oxide fuel cell according to claim 1 or 2, wherein
A solid oxide fuel cell, wherein a protective plate for preventing the liquid fuel from being directly injected to the other electrode is provided in the second reaction chamber. The solid oxide fuel cell according to claim 1,
As the vaporization means, a microwave application means for applying a microwave to the liquid fuel injected into the second reaction chamber,
A solid oxide fuel cell, wherein the shielding plate is provided with microwave leakage prevention means for preventing leakage of the microwave into the injector chamber.

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