JP2017107666A - Fuel cell system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell system in which efficiency of an oxidation reaction in a cathode solution is improved.SOLUTION: A fuel cell system includes: a fuel cell that generates power by reducing an oxidation-reduction substance in a cathode solution supplied to a cathode, by using a fuel gas supplied to an anode; a gas supply device for supplying an oxidation gas; a bubble generation device that makes bubbles of the oxidation gas supplied from the gas supply device be generated in the cathode solution discharged from the cathode; a reproducing device comprising an introduction port for introducing the cathode solution including the bubbles from the bubble generation device and an oxidation chamber for oxidizing an oxidation-reduction substance in the cathode solution introduced through the introduction port with the oxidation gas; and a solution supply device that re-supplies a cathode solution including an oxidized oxidation-reduction substance to the cathode. The introduction port is provided so that an introduction direction of the cathode solution deviates from a direction toward the center part of the oxidation chamber in a top view.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fuel cell system.

  For example, a redox flow type fuel cell system as disclosed in Patent Document 1 is known. Redox (RedOx: Reduction / Oxidation) is reduction and oxidation. This fuel cell system realizes a redox reaction at the cathode by circulating a cathode solution containing a redox substance (mediator) such as polyoxometalate (POM) between the cathode and the regenerator. .

  The redox material is reduced at the cathode, then regenerated by being oxidized by the regenerator and re-supplied to the cathode. For example, Patent Document 1 describes that an oxidizing agent is injected from an injection nozzle and blown into a cathode solution in a regenerator.

JP 2012-226972 A

  However, when a redox flow type fuel cell system is applied to, for example, an automobile power source, the oxidation reaction rate of the oxidation-reduction substance in the regenerator is insufficient, so that sufficient power can be obtained from the fuel cell. It can be difficult. On the other hand, if the size of the regenerator is increased, the oxidation reaction time can be increased, so that sufficient power can be obtained from the fuel cell, but a large space for mounting the regenerator on the automobile is required. Another problem arises.

  Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a fuel cell system in which the efficiency of the oxidation reaction of the cathode solution is improved.

  The fuel cell system described in this specification includes a fuel cell that generates power by reducing a redox substance in a cathode solution supplied to a cathode with a fuel gas supplied to an anode, and a gas supply that supplies the oxidizing gas. A bubble generating device for generating bubbles of the oxidizing gas supplied from the gas supply device into the cathode solution discharged from the cathode; and introducing the cathode solution containing the bubbles from the bubble generating device. A regenerator comprising an inlet, an oxidation chamber for oxidizing the redox material in the cathode solution introduced by the inlet with the oxidizing gas, and the redox material oxidized by the regenerator. A solution supply device for re-supplying the cathode solution containing the cathode solution to the cathode, wherein the introduction direction of the cathode solution is upward. Wherein are provided so as to be offset from the direction toward the center portion of the oxidation chamber in view.

  According to the present invention, the efficiency of the oxidation reaction of the cathode solution can be improved.

It is a block diagram which shows an example of a fuel cell system. It is an external view which shows an example of a reproducing | regenerating apparatus and a bubble generator. It is a top view of a reproducing | regenerating apparatus. It is a block diagram which shows the other example of a fuel cell system. It is a block diagram which shows the experimental system of the oxidation reaction by a reproducing | regenerating apparatus. It is a table | surface which shows the conditions and result of an experiment of an oxidation reaction. It is sectional drawing of the side view which shows an example of the bubble generator of an ejector system.

  FIG. 1 is a configuration diagram showing an example of a fuel cell system. The fuel cell system is a redox flow type, and is mounted on a vehicle such as an automobile, for example, and supplies electric power PW to a motor that drives the vehicle.

  The fuel cell system includes a hydrogen tank 11, a fuel gas pressure regulating valve 12, a fuel cell 13, a purge valve 14, a hydrogen circulation pump Ph, a regeneration device 21, a bubble generating device 22, a solution circulation pump Po, And an air compressor 31.

  The fuel cell 13 is connected to a fuel gas supply path R10 for supplying hydrogen gas, which is an example of fuel gas, and a fuel gas discharge path R11 for discharging hydrogen gas used for power generation. A hydrogen tank 11 and a fuel gas pressure regulating valve 12 are connected to the fuel gas supply path R10 in this order.

The hydrogen tank 11 is a hydrogen gas (H ₂ ) supply device, and stores hydrogen gas in a high pressure state. Hydrogen gas is introduced into the anode of the fuel cell 13 from the hydrogen tank 11 via the fuel gas pressure regulating valve 12. The pressure of the hydrogen gas is adjusted by passing through the fuel gas pressure regulating valve 12.

  Hydrogen gas (that is, off-gas) discharged from the fuel cell 13 is guided to the fuel gas discharge path R11. A purge valve 14 is provided in the middle of the fuel gas discharge path R11. The purge valve 14 is normally closed, but is opened when purging hydrogen gas from the fuel gas discharge path R11.

  A recirculation path R12 branches from the fuel gas discharge path R11. The branched recirculation path R12 is connected to the fuel gas supply path R10. The recirculation path R12 is provided with a hydrogen circulation pump Ph. The hydrogen circulation pump Ph guides the hydrogen gas discharged to the fuel gas discharge path R11 to the fuel gas supply path R10 via the recirculation path R12. . The hydrogen gas led from the recirculation path R12 to the fuel gas supply path R10 is resupplied to the fuel cell 13.

  Hydrogen gas is supplied to the anode of the fuel cell 13, and a cathode solution containing POM (polyoxometalate) as a redox material is supplied to the cathode of the fuel cell 13. The fuel cell 13 is configured as a stack of a plurality of fuel cells, and each fuel cell is composed of an anode electrode 13a and a cathode electrode 13c, and an electrolyte membrane 13b sandwiched between the anode electrode 13a and the cathode electrode 13c. Is provided.

  The electrolyte membrane 13b is, for example, a polymer electrolyte membrane formed of a fluorinated sulfonic acid polymer as a solid polymer material, and has good proton conductivity in a wet state. It is desirable that the anode electrode 13a and the cathode electrode 13c have, for example, a porous structure, a structure in which pressure loss is suppressed and a reaction area is large. The anode electrode 13a is provided with a platinum catalyst, and the hydrogen gas supplied to the anode electrode 13a is changed to protons (hydrogen ions) by the platinum catalyst.

On the other hand, a cathode solution containing POM circulates between the cathode electrode 13c and the regenerator 21. POM is a compound containing vanadium, molybdenum, tungsten, and the like. The POM in the cathode solution is reduced and converted to POM-H (reduced form) at the cathode electrode 13c by combining with the protons that have moved from the anode electrode 13a. That is, the reaction of POM + e ⁻ + H ⁺ → POM−H occurs at the cathode electrode 13c. Note that e ⁻ represents an electron.

  Thus, the fuel cell 13 generates power by reducing the POM in the cathode solution supplied to the cathode with the fuel gas supplied to the anode. The electric power PW obtained by power generation is supplied to, for example, a motor that drives the vehicle.

  Between the fuel cell 13 and the regenerator 21, a solution supply path R20 for supplying a cathode solution and a solution discharge path R21 for discharging the cathode solution used for power generation are connected. In the solution discharge path R21, there are a solution circulation pump Po for circulating the cathode solution between the fuel cell 13 and the regenerator 21, and a bubble generator 22 for generating bubbles in the cathode solution supplied to the regenerator 21. It is connected.

  The solution circulation pump Po is an example of a solution supply device, and resupplys the cathode solution to the cathode of the fuel cell 13. More specifically, the solution circulation pump Po pumps the cathode solution discharged from the fuel cell 13 to the regeneration device 21 by generating a circulation flow of the cathode solution between the fuel cell 13 and the regeneration device 21. Then, the cathode solution discharged from the regenerator 21 is pumped to the fuel cell 13.

  As an example, the bubble generator 22 is attached to the regenerator 21 and connected to a solution discharge path R21 and an oxidizing gas supply path R30 for supplying air as an oxidizing gas. The bubble generating device 22 may be separated from the regenerating device 21 and provided in the middle of the solution discharge path R21.

The air compressor 31 is an example of a gas supply device, and supplies air to the bubble generating device 22 via the oxidizing gas supply path R30. More specifically, the air compressor 31 takes in air containing oxygen (O ₂ ) from the outside of the vehicle, for example, and pumps it to the air compressor 31. In this embodiment, air is used as an example of the oxidizing gas. However, as will be described later, oxygen or ozone can be used as the oxidizing gas.

  In the bubble generating device 22, the cathode solution discharged from the cathode of the fuel cell flows from the solution discharge path R21, and the air supplied from the air compressor 31 flows from the oxidizing gas supply path R30. The bubble generator 22 generates air bubbles in the cathode solution. The bubble generating device 22 generates, for example, microbubbles having a diameter of about 10 to 100 (μm) as bubbles.

  As the bubble generating device 22, for example, a bubble generating nozzle disclosed in Japanese Unexamined Patent Application Publication No. 2009-189984 can be used. According to this bubble generation nozzle, the gas introduced into the nozzle is subdivided by the high-speed loop flow accelerated by the taper portion, so that air microbubbles can be generated.

  Thus, since the bubble generator 22 mixes air into the cathode solution as microbubbles, the efficiency of the oxidation reaction in the regenerator 21 can be improved as will be described later. The bubble generator 22 ejects a cathode solution containing air bubbles into the regenerator 21.

The regeneration device 21 regenerates POM (oxidant) by oxidizing POM-H in the cathode solution discharged from the cathode of the fuel cell 13 with oxygen contained in the air. The oxidation reaction performed in the regenerator 21 is expressed as O ₂ + 4POM−H → 2H ₂ O + 4POM.

  Connected to the regenerator 21 are a solution supply path R20 for resupplying the regenerated POM to the fuel cell 13, and an oxidizing gas discharge path R31 for discharging remaining air that is not used in the oxidation reaction. Yes. The solution circulation pump Po generates a cathode solution circulation flow between the fuel cell 13 and the regenerator 21, thereby causing the cathode solution containing the POM, that is, the POM oxidized by the regenerator 21, to the cathode of the fuel cell 13. Re-supply.

  FIG. 2 is an external view showing an example of the reproducing device 21 and the bubble generating device 22. The regenerator 21 has, for example, a substantially cylindrical outer shape, and includes a cathode solution inlet 211, a cathode solution outlet 212, and an air outlet 213. In addition, an oxidation chamber 210 in which the POM-H oxidation reaction is performed is provided inside the regenerator 21.

  The oxidation chamber 210 is a substantially cylindrical space, for example, and communicates with the introduction port 211 and the discharge ports 212 and 213. The shape of the oxidation chamber 210 is not limited to a substantially cylindrical shape, and may be, for example, a substantially quadrangular prism shape. Moreover, although the opening of the inlet port 211 and the discharge ports 212 and 213 has a circular shape as an example, the shape is not limited.

  The introduction port 211 introduces the cathode solution containing bubbles from the bubble generation device 22 to the oxidation chamber 210. The introduction port 211 is connected to the distal end portion 220 of the bubble generating device 22 and guides the cathode solution and bubbles ejected from the distal end portion 220 to the oxidation chamber 210. When the bubble generating device 22 is provided in the middle of the solution discharge path R21, the introduction port 211 is connected to the tip portion of the solution discharge path R21.

  The cathode solution is temporarily stored in the oxidation chamber 210 and is discharged out of the regenerator 21 through the discharge port 212. Since the discharge port 212 is connected to the solution supply path R <b> 20, the cathode solution containing POM oxidized in the oxidation chamber 210 is supplied to the cathode of the fuel cell 13.

  Further, air remaining without being used in the oxidation reaction, that is, bubbles rises in the oxidation chamber 210 and forms an air reservoir in the upper portion 210a. The upper part 210a of the oxidation chamber 210 communicates with the discharge port 213, and the discharge port 213 is connected to the oxidizing gas discharge path R31. For this reason, the air accumulated in the upper part 210 a of the oxidation chamber 210 is discharged from the exhaust port 213 to the outside of the regenerator 21.

  In the oxidation chamber 210, the temperature and the like are managed so as to provide an optimum environment for the oxidation reaction of POM-H. The POM-H in the cathode solution is oxidized by bubbles, that is, oxygen contained in the air.

  In the oxidation chamber 210, the catholyte solution generates a spiral vortex as shown by a symbol L and is led to the discharge port 212. For this reason, the residence time of bubbles in the oxidation chamber 210 is longer than when the catholyte solution does not generate a vortex (for example, a linear flow). Therefore, the allowable time for the oxidation reaction of POM-H can be extended, and the efficiency of the oxidation reaction is improved.

  Further, since the bubbles are microbubbles, the buoyancy acting on the bubbles is smaller than that of a normal size (for example, a diameter of about 1 (mm)). For this reason, the residence time of bubbles in the oxidation chamber 210 is further increased, and the allowable time for the oxidation reaction can be further extended.

  Furthermore, since the specific surface area of the microbubbles in contact with the cathode solution, that is, the surface area per unit volume is larger than that of the normal size bubbles, an oxidation reaction is likely to occur. Therefore, it is possible to further improve the efficiency of the oxidation reaction.

  The spiral vortex L of the cathode solution is generated by shifting the cathode solution introduction direction of the introduction port 211 from the direction toward the center of the oxidation chamber 210 in a top view.

  FIG. 3 is a top view of the playback device 21. That is, FIG. 3 shows the playback device 21 as viewed from above. Here, the top view means that the regenerator 21 is viewed in a direction perpendicular to the liquid level of the cathode solution stored in the regenerator 21. In FIG. 3, the same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.

  The introduction port 211 is provided so that the introduction direction D1 of the cathode solution is shifted from the direction D2 toward the central portion 210c of the oxidation chamber 210. More specifically, the introduction port 211 has a substantially cylindrical shape, and the direction in which the cathode solution flows along the central axis is the introduction direction D1. The introduction direction D1 is determined so that the cathode solution flows horizontally along the inner wall surface of the oxidation chamber 210, for example. The introduction direction D1 may be inclined upward or downward from the horizontal plane.

  As a result, the catholyte solution generates a spiral vortex L. The discharge direction of the cathode solution at the discharge port 212 is not limited. For example, it is preferable that the cathode solution is determined so as to flow horizontally along the inner wall surface of the oxidation chamber 210.

  Further, as can be understood from FIG. 2, the introduction port 211 is provided below the discharge port 212. More specifically, the introduction port 211 is provided in the vicinity of the bottom surface of the oxidation chamber 210. The introduction port 211 and the discharge port 212 are desirably provided at a position where the distance between the introduction port 211 and the discharge port 212 in the vertical direction is maximized in order to effectively extend the allowable time of the oxidation reaction described above.

  In the above-described embodiments, air is used as the oxidizing gas, but ozone may be used to further improve the efficiency of the oxidation reaction.

  FIG. 4 is a configuration diagram showing another example of the fuel cell system. In FIG. 4, the same reference numerals are given to configurations common to FIG. 1, and the description thereof is omitted.

  The fuel cell system includes a hydrogen tank 11, a fuel gas pressure regulating valve 12, a fuel cell 13, a purge valve 14, a hydrogen circulation pump Ph, a regeneration device 21, a bubble generating device 22, a solution circulation pump Po, An oxidizing gas pressure regulating valve 32 and an ozone tank 33 are provided. In this embodiment, since ozone is used as the oxidizing gas, the fuel cell system is provided with an ozone tank 33 instead of the air compressor 31 of the previous embodiment. When oxygen (pure oxygen) is used, an oxygen tank may be provided in place of the ozone tank 33.

  The ozone tank 33 is another example of the gas supply device, and supplies ozone to the bubble generating device 22 via the oxidizing gas supply path R30. The oxidizing gas pressure regulating valve 32 is provided in the oxidizing gas supply path R30 and adjusts the supply amount of ozone.

  The bubble generator 22 generates ozone microbubbles in the cathode solution, as in the previous embodiment. In the oxidation chamber 210 of the regenerator 21, POM-H contained in the cathode solution is oxidized by bubbles, that is, ozone. The efficiency of the oxidation reaction is improved as in the case of air due to the configuration described with reference to FIGS. This is the same when oxygen is used instead of ozone.

  As described with reference to FIG. 3, the ozone remaining without being used in the oxidation reaction is accumulated in the upper portion 210a of the oxidation chamber 210 and discharged to the outside through the oxidizing gas discharge path R31. At this time, when the amount of ozone discharged exceeds a predetermined regulated amount, an ozone decomposing device that decomposes ozone into oxygen may be provided in the middle of the oxidizing gas discharge path R31.

  Next, effects of the fuel cell system according to the embodiment will be described.

  FIG. 5 is a block diagram showing an experimental system for the oxidation reaction by the regenerator 21. The experimental system for the oxidation reaction includes a regenerator 21, a bubble generator 22, a solution tank 40, a pump 41, a solution flow meter 42, and a gas flow meter 43.

  The gas flow meter 43 measures the flow rate of the oxidizing gas supplied to the bubble generator 22. As the oxidizing gas, two types of ozone and oxygen are used. The solution flow meter 42 measures the flow rate of the cathode solution supplied to the bubble generator 22.

  The pump 41 circulates the cathode solution between the regenerator 21 and the solution tank 40 that stores the cathode solution. The pump 41 pumps the cathode solution 40 a in the solution tank 40 to the bubble generating device 22. The solution flow meter 42 is provided between the pump 41 and the bubble generating device 22.

  The regenerator 21 is fed with a cathode solution containing bubbles of oxidizing gas from the bubble generator 22. The bubble ejection position of the bubble generation device 22 is in the regenerator 21. At this time, the front end portion 220 of the bubble generating device 22 is connected to the inlet 211 of the reproducing device 21 as in the previous embodiment.

  In the solution tank 40, only the cathode solution containing POM-H is stored before the start of the experiment. When the experiment is started, the cathode solution circulates between the regenerator 21 and the solution tank 40, so that the cathode solution in the solution tank 40 increases in POM concentration with time. Further, in the upper part of the solution tank 40, the oxidizing gas 40b remaining from the regeneration device 21 without being used for the oxidation reaction stays. That is, in the solution tank 40, gas-liquid separation of the cathode solution 40a and the oxidizing gas 40b is performed.

  In this example, the experiment time is set to 180 (minutes), and the POM oxidation-reduction potential (ORP) of the cathode solution in the solution tank 40 is measured before and after the start of the experiment. ORP is a potential generated when electrons are exchanged in the oxidation-reduction reaction system. For this reason, the greater the difference between the ORP before and after the start of the experiment, the higher the concentration of oxidant POM. That is, the larger the ORP difference, the higher the efficiency of the oxidation reaction in the regenerator 21.

  FIG. 6 shows the experimental conditions and results of the oxidation reaction. In this example, four types of experiments with different conditions (see “Experiment No.”) are performed. “Bubble diameter” indicates the diameter of a bubble generated by the bubble generator 22. The diameter of the bubbles was determined according to Experiment No. 1 is about 1 (mm). In 2-4, it is set as about 10-100 (micrometer). Experiment No. In 2-4, the bubble generator 22 which generates a microbubble is used like an Example. In contrast, Experiment No. 1, as a comparative example, an ejector type bubble generating device 22 is used to generate bubbles having a diameter larger than that of microbubbles.

  FIG. 7 is a cross-sectional view in side view showing an example of an ejector type bubble generator 22. The ejector type bubble generator 22 has a structure in which an inflow pipe 221 for flowing an oxidizing gas into the cathode solution is inserted into a cylindrical main body portion 222 through which the cathode solution flows.

  The oxidizing gas flowing in from the inflow pipe 221 is decomposed into bubbles 221a and 221b by the flow of the cathode solution in the main body 222 (see the arrow). However, since the bubble generator 22 of the ejector type simply generates bubbles by a linear flow of the cathode solution, unlike the case of microbubbles, it cannot generate bubbles having a small diameter.

  Referring again to FIG. 6, “Bubble introduction direction” indicates a direction in which the bubbles of the bubble generation device 22 are introduced into the regeneration device 21. Experiment No. 1 and 2, the bubble generating device 22 ejects bubbles of oxidizing gas along the direction D2 (center direction) toward the central portion 210c shown in FIG. Therefore, Experiment No. 1 and 2, the catholyte solution in the regenerator 21 rises in the vertical direction from the inlet 211 and is discharged from the outlet 212 without generating a spiral vortex L.

  In contrast, Experiment No. In 3 and 4, the bubble generating device 22 ejects the bubbles of the oxidizing gas to the reproducing device 21 along the direction D1 shifted from the direction D2 toward the central portion 210c shown in FIG. Therefore, Experiment No. In 3 and 4, the cathode solution in the regenerator 21 rises from the inlet 211 and is discharged from the outlet 212 while generating a spiral vortex L.

  For “oxidizing gas”, the experiment No. 1 to 3 use oxygen as the oxidizing gas. In 4, a mixed gas of ozone and oxygen is used as the oxidizing gas. Experiment No. In No. 4, an ozone generator is used, and 100 (ppm) ozone is mixed with 1 (L / min.) Of oxygen.

  Other conditions are the same as those in Experiment No. 1 to 4 are common. The flow rate of the oxidizing gas measured by the gas flow meter 43 is 1 (L / min.), And the temperature of the oxidizing gas is room temperature. The flow rate of the cathode solution measured by the solution flow meter 42 is 2 (L / min.), And the temperature of the cathode solution is 80 (° C.). The POM concentration of the cathode solution before the experiment is 0.33 (M).

  “ORP (mV)” represents the result of the experiment. The “difference” is a difference between the ORP of the cathode solution before the experiment (see “before experiment”) and after the experiment (see “after experiment”), and is a parameter indicating the efficiency of the oxidation reaction in the regenerator 21 as described above. is there.

  Experiment No. 1 and Experiment No. 2 is compared, the experiment No. 2 is the same as that of Experiment No. It is about 50 times the difference of 1. For this reason, it is understood that when the microbubble bubble generating device 22 is used, the efficiency of the oxidation reaction is improved as compared with the case where the ejector type bubble generating device 22 is used. That is, it can be seen that the smaller the bubbles, the higher the efficiency of the oxidation reaction.

  In addition, Experiment No. 2 and Experiment No. 3 are compared, the experiment No. 3 is compared. 3 is the same as that of Experiment No. It is about 3 times the difference of 2. For this reason, when the bubble generating device 22 ejects bubbles in the direction D1 deviated from the direction D2 toward the central portion 210c in the reproducing device 21, the efficiency of the oxidation reaction is determined by the bubble generating device 22 in the reproducing device 21. It is understood that this is improved as compared with the case where bubbles are ejected in the direction D2 toward the center portion 210c. That is, Experiment No. In the case of No. 3, since the vortex of the cathode solution is generated in the oxidation chamber 210 of the regenerator 21, the residence time of bubbles in the oxidation chamber 210 is the same as in Experiment No. 3 where no vortex is generated. It can be seen that the efficiency of the oxidation reaction is increased.

  In addition, Experiment No. 3 and Experiment No. 4 are compared, the experiment No. 4 is compared. 4 is the same as that of Experiment No. The difference of 3 is about 1.3 times. For this reason, it is understood that when the mixed gas of ozone and oxygen is used, the efficiency of the oxidation reaction is improved as compared with the case where only oxygen is used. That is, it can be seen that the use of ozone as the oxidizing gas increases the efficiency of the oxidation reaction.

  Summarizing these experimental results, the experiment No. using the best conditions was obtained. The difference of 4 indicates the experiment No. using the worst condition. The difference of 1 is about 200 times. Therefore, Experiment No. It can be seen that the efficiency of the oxidation reaction can be significantly improved by applying the condition 4 to the fuel cell system.

  As described above, the fuel cell system according to the embodiment includes the fuel cell 13, the fuel cell 13, the regenerator 21, the bubble generator 22, and the air compressor 31 or the ozone tank 33.

  The fuel cell 13 generates power by reducing the POM in the cathode solution supplied to the cathode with hydrogen gas supplied to the anode. The air compressor 31 supplies air as an oxidizing gas, and the ozone tank 33 supplies ozone as an oxidizing gas. When oxygen is used as the oxidizing gas, the fuel cell system has an oxygen tank that supplies oxygen instead of the air compressor 31 or the ozone tank 33.

  The bubble generation device 22 generates bubbles of the oxidizing gas supplied from the air compressor 31 or the ozone tank 33 in the cathode solution discharged from the cathode. The regenerator 21 includes an inlet 211 for introducing a cathode solution containing bubbles from the bubble generator 22 and an oxidation chamber 210 for oxidizing POM-H in the cathode solution introduced by the inlet 211 with an oxidizing gas. . The regenerator 21 re-supplys the cathode solution containing the oxidized POM to the cathode of the fuel cell 13.

  The introduction port 211 is provided so that the introduction direction D1 of the cathode solution is deviated from the direction D2 toward the central portion 210c of the oxidation chamber 210 in a top view.

  According to the above configuration, the introduction port 211 is provided such that the introduction direction D1 of the cathode solution is deviated from the direction D2 toward the central portion 210c of the oxidation chamber 210 in a top view, and therefore, the cathode solution in the oxidation chamber 210 is provided. A spiral vortex L is generated. For this reason, the residence time of bubbles in the oxidation chamber 210 is longer than that in the case where the cathode solution does not generate the vortex L.

  Therefore, the allowable time for the oxidation reaction of POM-H can be extended. Therefore, according to the fuel cell system according to the embodiment, the efficiency of the oxidation reaction is improved. In this way, the electric power obtained from the fuel cell 13 can be increased without increasing the size of the regenerator 21.

  The above-described embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 13 Fuel cell 21 Regenerating apparatus 22 Bubble generating apparatus 31 Air compressor 33 Ozone tank 211 Inlet 210 Oxidation chamber Po Solution circulation pump

Claims (1)

A fuel cell that generates electricity by reducing the redox material in the cathode solution supplied to the cathode with the fuel gas supplied to the anode;
A gas supply device for supplying an oxidizing gas;
A bubble generating device for generating bubbles of the oxidizing gas supplied from the gas supply device in the cathode solution discharged from the cathode;
Regeneration provided with an inlet for introducing the cathode solution containing bubbles from the bubble generator, and an oxidation chamber for oxidizing the redox material in the cathode solution introduced by the inlet with the oxidizing gas. Equipment,
A solution supply device that re-feeds the cathode solution containing the redox material oxidized by the regeneration device to the cathode;
The fuel cell system according to claim 1, wherein the introduction port is provided so that an introduction direction of the cathode solution is deviated from a direction toward the center of the oxidation chamber in a top view.

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