JP2014060051A - Fuel cell system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell system that effectively collects flakes falling off an oxygen-side electrode.SOLUTION: A fuel cell system 1 comprises: a fuel cell 2; a fuel supply section 3; an oxygen supply section 4; and a discharge section 5. The fuel cell 2 has an electrolyte layer 14, a fuel-side electrode 12 formed on a first side surface of the electrolyte layer 14, and an oxygen-side electrode 13 formed on a second side surface of the electrolyte layer 14. The fuel supply section 3 supplies liquid fuel to the fuel-side electrode 12. The oxygen supply section 4 supplies oxygen to the oxygen-side electrode 13. The discharge section 5 allows emissions containing flakes 33 of the oxygen-side electrode 13 to be discharged from the oxygen-side electrode 13. The discharge section 5 has: a discharge line 6; and an electrical collection section 7 that is provided in the discharge line 6 and that electrochemically collects the flakes 33 of the oxygen-side electrode 13 from the emissions.

Description

  The present invention relates to a fuel cell system, and more particularly to a fuel cell system to which liquid fuel is supplied.

  Conventionally, various fuel cells such as alkaline type (AFC), solid polymer type (PEFC), phosphoric acid type (PAFC), molten carbonate type (MCFC), and solid electrolyte type (SOFC) are known as fuel cells. Yes. These fuel cells are being studied for use in various applications such as automobile applications.

  For example, a polymer electrolyte fuel cell includes a fuel-side electrode (anode catalyst layer) to which fuel is supplied and an oxygen-side electrode (cathode catalyst layer) to which oxygen is supplied. Oppositely arranged with an electrolyte layer made of a polymer membrane in between.

  Specifically, such a polymer electrolyte fuel cell includes an electrolyte layer made of an anion exchange membrane, and a fuel side electrode and an oxygen side electrode that are arranged to face each other with the electrolyte layer interposed therebetween, and hydrazines as a fuel A fuel cell to which a liquid fuel is supplied is known (see, for example, Patent Document 1).

  In such a fuel cell, fuel is supplied to the fuel side electrode and air is supplied to the oxygen side electrode, whereby an electromotive force is generated between the fuel side electrode and the oxygen side electrode.

JP 2006-244961 A

  On the other hand, in such a fuel cell, liquid fuel is supplied to the fuel-side electrode, but the supplied liquid fuel does not react at the fuel-side electrode and permeates the electrolyte layer by osmotic pressure to the oxygen-side electrode. May leak (crossover phenomenon).

  In such a case, the liquid fuel reacts with oxygen in the oxygen-side electrode or is decomposed to generate gas and expand the volume.

  Therefore, the internal pressure of the oxygen side electrode is increased, and the debris of the oxygen side electrode may be peeled off from the surface of the electrolyte layer, and the debris of the oxygen side electrode peeled off from the electrolyte layer is It is required to collect (collect) without directly disposing of it.

  Therefore, an object of the present invention is to provide a fuel cell system capable of efficiently collecting the pieces of oxygen-side electrode that have been peeled off.

  In order to achieve the above object, a fuel cell system of the present invention includes an electrolyte layer, a fuel side electrode formed on one side surface of the electrolyte layer, and an oxygen side electrode formed on the other side surface of the electrolyte layer. A fuel cell; a fuel supply means for supplying liquid fuel to the fuel side electrode; an oxygen supply means for supplying oxygen to the oxygen side electrode; and an exhaust containing debris of the oxygen side electrode from the oxygen side electrode A discharge portion that discharges, and the discharge portion is provided in the discharge line, and an electric collecting means that electrochemically collects fragments of the oxygen-side electrode from the discharge. It is characterized by having.

  In such a fuel cell system, due to leakage of liquid fuel to the oxygen side electrode due to the crossover phenomenon, a part of the oxygen side electrode may be peeled off as a fragment from the surface of the electrolyte layer. The oxygen-side electrode debris thus peeled off is discharged to the discharge line as discharge.

  Since the discharged oxygen-side electrode fragments are usually charged, they can be collected electrochemically by the electric collecting means provided in the discharge line.

  Therefore, according to such a fuel cell system, it is possible to efficiently collect pieces of the oxygen-side electrode that have been peeled off.

  In the fuel cell system according to the present invention, the discharge unit may further include a return line for returning the discharged matter to the fuel supply means on the downstream side of the electrical collection means of the discharge line. Is preferred.

  In such a fuel cell system, when the fragments of the oxygen-side electrode in the discharge are collected by the electric collecting means, the leaked liquid fuel can be recovered, and the recovered liquid fuel is recirculated. The fuel can be returned to the fuel supply means via the line and reused. Therefore, the utilization efficiency of liquid fuel can be improved.

  When liquid fuel is recovered and reused, if oxygen-side electrode fragments are mixed in the liquid fuel, the oxygen-side electrode fragments may promote the self-decomposition of the liquid fuel. . However, in the fuel cell system described above, the reflux line is provided on the downstream side of the electrical collecting means, so that it is possible to prevent the oxygen-side electrode debris from being mixed into the refluxed liquid fuel. Liquid fuel can be reused with excellent efficiency.

  Furthermore, in the fuel cell system described above, since the electric collecting means is used to collect the oxygen-side electrode debris, for example, compared with the case where the oxygen-side electrode debris is collected by a filter or the like. Thus, the pressure loss in the transportation of the liquid fuel reflux line can be suppressed, and the liquid fuel can be reused with excellent efficiency.

  According to the fuel cell system of the present invention, even when liquid fuel leaks to the oxygen side electrode due to the crossover phenomenon, and the oxygen side electrode peels off as fragments, the oxygen side electrodes can be efficiently collected. Can do.

FIG. 1 is a schematic configuration diagram showing an embodiment of a fuel cell system of the present invention.

1. 1 is a schematic configuration diagram showing an embodiment of a fuel cell system of the present invention.

  In FIG. 1, a fuel cell system 1 includes a fuel cell 2, a fuel supply unit 3 as a fuel supply unit, an oxygen supply unit 4 as an oxygen supply unit, and a discharge unit 5 for discharging discharged matter (described later). And.

  The fuel cell 2 is a polymer electrolyte fuel cell, and includes a plurality of fuel cells S, and is formed as a stack structure in which these fuel cells S are stacked. In FIG. 1, one fuel cell S is taken out for easy illustration.

  The fuel cell S includes an electrolyte layer 14, a fuel side electrode 12 as an electrode formed on one side surface of the electrolyte layer 14, and an oxygen side electrode 13 as an electrode formed on the other side surface of the electrolyte layer 14. Yes.

  The electrolyte layer 14 is a layer in which an anion component can move, and is formed using, for example, an anion exchange membrane.

The anion exchange membrane is not particularly limited as long as it is a medium in which an anion component (for example, hydroxide ion (OH ⁻ )) can move, and for example, an anion exchange group such as a quaternary ammonium group or a pyridinium group can be used. And a solid polymer membrane (anion exchange resin).

  Examples of the solid polymer forming the anion exchange membrane include hydrocarbon-based solid polymer membranes such as polystyrene and modified products thereof.

  The solid polymer forming the anion exchange membrane may have a cross-linked structure in its molecular structure.

  Moreover, an anion exchange membrane is available as a commercial item, for example, Selemion (made by Asahi Glass Co., Ltd.), Neoceptor (made by Astom Corp.), etc. are mentioned.

  Moreover, the film thickness of the electrolyte layer 14 is 10-100 micrometers, for example.

  The fuel side electrode 12 is formed of an electrode material such as a catalyst carrier carrying a catalyst, for example. Alternatively, a catalyst may be used as the electrode material without using the catalyst carrier, and the catalyst may be formed directly as the fuel-side electrode 12.

  The catalyst is not particularly limited, and examples thereof include platinum group elements (ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), platinum (Pt)), iron group elements ( According to a periodic table such as iron (Fe), cobalt (Co), nickel (Ni)) (IUPAC Periodic Table of the Elements (version date 22 June 2007), the same applies hereinafter) Group 8 to 10 (VIII) elements, For example, simple metals such as Group 11 (IB) elements of the periodic table such as copper (Cu), silver (Ag), and gold (Au) can be used.

  These can be used alone or in combination of two or more.

  Examples of the catalyst carrier include porous substances such as carbon.

  The amount of the catalyst supported on the catalyst carrier is not particularly limited, and is appropriately set according to the purpose and application.

  The thickness of the fuel side electrode 12 is, for example, 10 to 200 μm, preferably 20 to 100 μm.

  The oxygen side electrode 13 is formed of, for example, an electrode material such as a catalyst carrier carrying a catalyst, similarly to the fuel side electrode 12 described above. Alternatively, a catalyst may be used as the electrode material without using the catalyst carrier, and the catalyst may be formed directly as the oxygen side electrode 13.

  In the oxygen-side electrode 13, as the electrode material, for example, a complex formed of a complex-forming organic compound and / or a conductive polymer and carbon (hereinafter, this complex is referred to as “carbon composite”), a transition metal. A catalyst on which is supported can also be used.

  Examples of the transition metal include scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu ), Yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), technetium (Tc), ruthenium (Ru), rhodium (Rh), palladium (Pd), silver (Ag), lanthanum (La) ), Hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), and the like. Among these, Preferably, silver and cobalt are mentioned. These may be used alone or in combination of two or more.

  A complex-forming organic compound is an organic compound that forms a complex with a metal atom by coordinating with the metal atom. And complex-forming organic compounds such as these or polymers thereof. Among these, Preferably, the polypyrrole which is a polymer of pyrrole is mentioned. These may be used alone or in combination of two or more.

  As the conductive polymer, there is a compound overlapping with the above complex-forming organic compound, for example, polyaniline, polypyrrole, polythiophene, polyacetylene, polyvinylcarbazole, polytriphenylamine, polypyridine, polypyrimidine, polyquinoxaline, polyphenylquinoxaline, Examples include polyisothianaphthene, polypyridinediyl, polythienylene, polyparaphenylene, polyflurane, polyacene, polyfuran, polyazulene, polyindole, and polydiaminoanthraquinone. Among these, Preferably, a polypyrrole is mentioned. These may be used alone or in combination of two or more.

  The thickness of the oxygen side electrode 13 is, for example, 10 to 300 μm, preferably 20 to 150 μm.

  The fuel side electrode 12 and the oxygen side electrode 13 together with the electrolyte layer 14 form one membrane / electrode assembly.

  The fuel battery cell S further includes a fuel supply member 15 and an oxygen supply member 16.

  The fuel supply member 15 is made of a gas-impermeable conductive member, and one surface thereof is opposed to the surface of the fuel-side electrode 12 opposite to the surface in contact with the electrolyte layer 14. . The fuel supply member 15 is formed with a fuel-side flow channel 17 for bringing fuel into contact with the entire fuel-side electrode 12 as a distorted groove recessed from one surface. The fuel-side flow path 17 is formed with a supply port 18 and a discharge port 19 passing through the fuel supply member 15 at the upstream end and the downstream end, respectively.

  Similarly to the fuel supply member 15, the oxygen supply member 16 is also made of a gas-impermeable conductive member, and one surface thereof is opposite to the surface in contact with the electrolyte layer 14 in the oxygen-side electrode 13. Opposite contact is made with the side surface. The oxygen supply member 16 is also formed with an oxygen-side flow channel 20 for bringing oxygen (air) into contact with the entire oxygen-side electrode 13 as a distorted groove recessed from one surface. The oxygen-side flow path 20 is also formed with a supply port 21 and a discharge port 22 passing through the oxygen supply member 16 at the upstream end and the downstream end, respectively.

  The fuel cell 2 is formed as a stack structure in which a plurality of fuel cells S are stacked as described above. Therefore, although not shown, the fuel supply member 15 and the oxygen supply member 16 are configured (also used) as separators in which the fuel side channel 17 and the oxygen side channel 20 are formed on both surfaces.

  Although not shown in FIG. 1, the fuel cell 2 is provided with a current collector plate formed of a conductive material, and the electromotive force generated in the fuel cell 2 is provided in the current collector plate. It is taken out from the terminal.

  Further, on a test (model) basis, the fuel supply member 15 and the oxygen supply member 16 are connected by an external circuit 23, and the voltmeter 24 is interposed in the external circuit 23, thereby generating the fuel cell 2. The voltage can also be measured.

  The fuel supply unit 3 is provided to supply liquid fuel to the fuel-side electrode 13, and includes a fuel tank 25 that stores liquid fuel (hereinafter sometimes simply referred to as “fuel”), and a fuel tank. And a fuel supply passage 26 for supplying liquid fuel in the fuel electrode 12 to the fuel side electrode 12.

  The fuel tank 25 is formed to be able to store liquid fuel from, for example, a heat and pressure resistant container. A deaeration port 30 for releasing gas from the fuel tank 25 is provided on the upper surface of the fuel tank 25 as necessary.

Examples of the liquid fuel stored in the fuel tank 25 include a liquid fuel containing hydrazines. Specifically, for example, anhydrous hydrazine (NH ₂ NH ₂ ), hydrazine hydrate (NH ₂ NH _2. An aqueous solution of hydrazine such as H ₂ O), for example, an aqueous solution of hydrazines such as triazane (NH ₂ NHNH ₂ ) and tetrazane (NH ₂ NHNHNH ₂ ).

  Further, for example, alkali metal hydroxides such as potassium hydroxide and sodium hydroxide can be added to the liquid fuel as additives. The addition amount of the additive is not particularly limited, and is appropriately set according to the purpose and application.

  The fuel compound may be supplied as it is, or may be supplied as a solution of water and / or alcohol (for example, lower alcohols such as methanol, ethanol, propanol, isopropanol). In this case, the concentration of the fuel compound in the solution varies depending on the type of the fuel compound, but is, for example, 1 to 90% by mass, preferably 1 to 30% by mass.

  The fuel supply path 26 has one end on the upstream side connected to a fuel outlet (not shown) of the fuel tank 25 and the other end connected to the supply port 18 of the fuel side flow path 17. A fuel supply pump 27 is interposed in the middle of the fuel supply path 26.

  The fuel supply pump 27 is a pump for flowing the fuel in the fuel tank 25 to the fuel supply path 26. For example, a rotary pump, a rotary pump such as a gear pump, a reciprocating pump such as a piston pump, a diaphragm pump, etc. This is a known liquid feed pump. The fuel supply pump 27 is electrically connected to a control unit (not shown), and is operated by an input signal from the control unit (not shown), and its output is controlled. By controlling the output of the fuel supply pump 27, the flow rate of the fuel flowing through the fuel supply path 26 is controlled.

  The oxygen supply unit 4 is provided for supplying oxygen to the oxygen side electrode 13, and specifically includes an oxygen supply path 28 for supplying oxygen to the oxygen side electrode 13.

  The oxygen supply path 28 has one end on the upstream side opened to the atmosphere and the other end on the downstream side connected to the supply port 21 of the oxygen side flow path 20 in the oxygen supply member 16. An oxygen supply pump 29 is interposed in the middle of the oxygen supply path 28.

  The oxygen supply pump 29 is a pump for flowing oxygen in the atmosphere to the oxygen supply path 28, and is a known air supply pump such as an air compressor. The oxygen supply pump 29 is electrically connected to a control unit (not shown), and is operated by an input signal from the control unit (not shown) and its output is controlled. By controlling the output of the oxygen supply pump 29, the flow rate of oxygen flowing through the oxygen supply path 28 is controlled.

  The discharge unit 5 is provided to discharge the discharge (which will be described in detail later, the discharge containing the fragments 33 of the oxygen-side electrode 13) from the oxygen-side electrode 13, and includes a discharge line 6 and a discharge line 6 The electrical collection part 7 as an electrical collection means provided in this and the recirculation | reflux line 8 provided in the downstream rather than the electrical collection part 7 of the discharge line 6 are provided.

  The discharge line 6 is a discharge path for discharging discharge (described later) discharged from the oxygen side electrode 13, and one end on the upstream side is connected to the discharge port 22 of the oxygen side flow path 20 in the oxygen supply member 16. The other end on the downstream side is connected to the upstream end of the reflux line 8.

  The electric collector 7 is provided for electrochemically collecting the oxygen-side electrode 13 from the discharge, and a pair of electrodes 31 provided inside the discharge line 6 and the outside of the discharge line 6 are provided. And an external power source 32 that is electrically connected to the pair of electrodes 31.

  The electrode 31 is a known electrode formed in, for example, a plate shape or a rod shape, and is disposed inside the discharge line 6 along the flow direction of the discharged matter. Although it does not restrict | limit especially as the electrode 31, The electrode inactive with respect to the above-mentioned liquid fuel is mentioned, Specifically, a stainless steel electrode etc. are mentioned. One of the electrodes 31 functions as a positive electrode and the other as a negative electrode.

  The external power supply 32 is not particularly limited as long as a voltage can be applied to each electrode 31, and a known power supply device is used.

The reflux line 8 is provided in order to return the discharged matter to the fuel supply unit 3 on the downstream side of the electrical collection unit 7 of the discharge line 6. Specifically, the reflux line 8 has one upstream end connected to the downstream end of the discharge line 6 and the other end connected to the fuel tank 25 of the fuel supply unit 3.
2. Next, power generation of the fuel cell system 1 will be described.

  In the fuel cell system 1 described above, the fuel supply pump 27 and the oxygen supply pump 29 are operated by a control unit (not shown). As a result, liquid fuel is supplied to the fuel supply path 26, and oxygen is supplied to the oxygen supply path 28.

As a result, oxygen (air) is supplied to the oxygen-side flow path 20 of the oxygen supply member 16, and the above-described fuel is supplied to the fuel-side flow path 17 of the fuel supply member 15. Then, in the oxygen side electrode 13, as described below, electrons (e ⁻ ), water (H ₂ O), oxygen (O ₂ ) that are generated in the fuel side electrode 12 and move through the external circuit 23. ) React with each other to produce hydroxide ions (OH ⁻ ). The generated hydroxide ions (OH ⁻ ) move from the oxygen side electrode 13 to the fuel side electrode 12 through the electrolyte layer 14 made of an anion exchange membrane. In the fuel-side electrode 12, the hydroxide ions (OH ⁻ ) that have passed through the electrolyte layer 14 react with the fuel to generate electrons (e ⁻ ). The generated electrons (e ⁻ ) are moved from the fuel supply member 15 to the oxygen supply member 16 via the external circuit 23 and supplied to the oxygen side electrode 13. An electromotive force is generated by such an electrochemical reaction in the fuel side electrode 12 and the oxygen side electrode 13, and power generation is performed.

For example, when hydrazine (NH ₂ NH ₂ ) is used as the fuel, the above reaction can be expressed by the following reaction formulas (1) to (3) as the fuel side electrode 12, the oxygen side electrode 13 and the whole. it can.
(1) NH ₂ NH ₂ + 4OH ⁻ → 4H ₂ O + N ₂ + 4e ⁻ (fuel side electrode)
(2) O ₂ + 2H ₂ O + 4e ⁻ → 4OH ⁻ (oxygen side electrode)
(3) NH ₂ NH ₂ + O ₂ → 2H ₂ O + N ₂ (whole)
The operating conditions of the fuel cell 2 are not particularly limited. For example, the pressure on the fuel side electrode 12 side is 100 kPa or less, preferably 50 kPa or less, and the pressure on the oxygen side electrode 13 side is 100 kPa or less. Preferably, it is 50 kPa or less, and the temperature of the fuel cell S is set to 30 to 100 ° C., preferably 60 to 90 ° C.
3. In the fuel cell system 1 described above, the liquid fuel is supplied to the fuel side electrode 12 of the fuel cell 2, but the supplied liquid fuel does not react at the fuel side electrode 12, and the electrolyte The layer 14 may permeate through the osmotic pressure and leak to the oxygen side electrode 13 (crossover phenomenon).

  In such a case, the liquid fuel reacts with oxygen in the oxygen-side electrode 13 or is decomposed to generate gas and expand the volume.

That is, for example, when hydrazines, specifically hydrazine, hydrated hydrazine, or the like is used as the liquid fuel, the liquid fuel leaked to the oxygen side electrode 13 side is oxygen as shown in the following formula (4). May generate gas (nitrogen gas), or may be decomposed as shown in the following formula (5) to generate gas (nitrogen gas and hydrogen gas).
(4) NH ₂ NH ₂ + O ₂ → N ₂ + 2H ₂ O (reaction between hydrazine and oxygen)
(5) NH ₂ NH ₂ → N ₂ + H ₂ (decomposition reaction of hydrazine)
Thus, in the oxygen side electrode 13, the liquid fuel (NH ₂ NH ₂ ) becomes a gas (N ₂ , H ₂ ), and volume expansion occurs.

  Therefore, the internal pressure of the oxygen side electrode 13 increases, and a part of the oxygen side electrode 13 may be peeled off as a broken piece 33 from the surface of the electrolyte layer 14, and the oxygen side electrode 13 peeled off from the electrolyte layer 14 may be removed. The debris 33 is required to be collected (collected) without being directly discarded from the viewpoint of environmental load.

  In this regard, since the fragments 33 of the oxygen-side electrode 13 discharged as described above are usually charged, in this fuel cell system 1, the electric collector 7 provided in the discharge line 6 causes the Can be collected chemically.

  Hereinafter, a method for collecting the fragments 33 of the oxygen-side electrode 13 by the fuel cell system 1 will be described in detail.

  Specifically, in the fuel cell system 1, a voltage is applied to the pair of electrodes 31 by the external power supply 32 of the electrical collection unit 7 together with the power generation described above. The applied voltage is not particularly limited, and is appropriately set according to the purpose and application.

  As a result, the pair of electrodes 31 is charged as a positive electrode or a negative electrode, and a Coulomb force is generated between the oxygen electrode 13 and the debris 33.

  Due to this Coulomb force, the fragments 33 of the oxygen-side electrode 13 are electrically connected to one of the pair of electrodes 31 (for example, the electrode 31 that is a negative electrode when the oxygen-side electrode 13 is positively charged). And is collected at the electrode 31.

  The collected debris 33 of the oxygen side electrode 13 is removed from the discharge line 6 by an appropriate method.

  On the other hand, the liquid fuel passes through the electrical collection unit 7, is returned to the fuel tank 25 through the return line 8, and is supplied to the fuel cell 2 again.

  As described above, according to the fuel cell system 1 described above, even when the liquid fuel leaks to the oxygen side electrode 13 due to the crossover phenomenon and the oxygen side electrode 13 is peeled off as the debris 33, the fragments of the oxygen side electrode 13 are separated. 33 can be efficiently collected.

  Further, in such a fuel cell system 1, when the oxygen-side electrode 13 in the discharge is collected by the electrical collection unit 7, the leaked liquid fuel can be collected, and the collected liquid fuel Can be recirculated to the fuel supply unit 3 via the recirculation line 8 and reused.

  Therefore, according to such a fuel cell system 1, the utilization efficiency of liquid fuel can be improved.

  Further, when liquid fuel is recovered and reused, if the fragment 33 of the oxygen side electrode 13 is mixed in the liquid fuel, the fragment 33 of the oxygen side electrode 13 promotes self-decomposition of the liquid fuel. May end up. However, in the fuel cell system 1 described above, since the reflux line 8 is provided on the downstream side of the electrical collection unit 7, the fragments 33 of the oxygen side electrode 13 are mixed into the refluxed liquid fuel. The liquid fuel can be reused with excellent efficiency.

  Furthermore, in the fuel cell system 1 described above, since the electrical collection unit 7 is used to collect the debris 33 of the oxygen side electrode 13, the debris 33 of the oxygen side electrode 13 is removed by, for example, a filter. Compared with the case of collecting, pressure loss in transportation of the liquid fuel reflux line 8 can be suppressed, and the liquid fuel can be reused with excellent efficiency.

  Although one embodiment of the present invention has been described above, the present invention can be implemented in other forms.

  For example, in the above-described embodiment, the reflux line 8 is connected to the downstream side of the discharge line 6, and after collecting the debris 33 of the oxygen side electrode 13, the liquid fuel is returned to the fuel tank 25. It is also possible to provide a storage tank for storing the discharge without providing 8, and transport the liquid fuel after collecting the debris 33 from the discharge line 6 directly to the storage tank (see broken line).

  Further, for example, in the above-described embodiment, the present invention has been described by exemplifying a solid polymer fuel cell. However, the present invention is, for example, an alkaline type using an aqueous KOH solution or an aqueous NaOH solution as the electrolyte layer 14, It can also be applied to various fuel cells such as a molten carbonate type and a solid electrolyte type.

  Examples of the use of the fuel cell system 1 include a power source for driving motors in automobiles, ships, and aircraft, and a power source in communication terminals such as mobile phones.

DESCRIPTION OF SYMBOLS 1 Fuel cell system 2 Fuel cell 3 Fuel supply part 4 Oxygen supply part 5 Discharge part 6 Discharge line 7 Electrical collection part 12 Fuel side electrode 13 Oxygen side electrode 14 Electrolyte layer 33 Fragment

Claims (2)

A fuel cell comprising an electrolyte layer, a fuel side electrode formed on one side surface of the electrolyte layer, and an oxygen side electrode formed on the other side surface of the electrolyte layer;
Fuel supply means for supplying liquid fuel to the fuel side electrode;
Oxygen supply means for supplying oxygen to the oxygen side electrode;
A discharge part for discharging the waste containing the oxygen-side electrode debris from the oxygen-side electrode,
The discharge unit includes a discharge line,
A fuel cell system, comprising: an electric collection means provided in the discharge line and electrochemically collecting fragments of the oxygen side electrode from the discharge.   The said discharge part is further equipped with the recirculation | reflux line which recirculate | circulates the said discharge | emission to the said fuel supply means in the downstream of the said electrical collection means of the said discharge line, The said 1st aspect is characterized by the above-mentioned. Fuel cell system.

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