JP2006032078A - Fuel cell generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell generator which removes nitrogen of an impurity contained in an oxidizer gas, and suppresses deterioration by nitrogen oxide, and is improved in durability. <P>SOLUTION: The fuel cell generator comprises a nitrogen oxide removing means 9 for removing nitrogen oxide contained in the oxidizer gas and a fuel cell 5 made of an electrolyte 1, a pair of electrodes 21, 22, and a pair of separator plates 41, 42. Since it removes nitrogen oxide possibly existing in the reduction gas, and prevents entering into the fuel cell 5, deterioration of the battery voltage can be suppressed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel cell power generation device that is intended to suppress deterioration due to nitrogen oxides contained in an oxidant gas or to improve durability.

  The configuration and operation of a conventional general solid polymer electrolyte fuel cell will be described with reference to FIG. In FIG. 3, reference numeral 1 denotes a solid polymer electrolyte made of perfluorocarbon sulfonic acid having hydrogen ion conductivity. An anode 21 and a cathode 22 are formed as a pair of electrodes on both surfaces of the electrolyte 1. The anode 21 and the cathode 22 have a catalyst layer made of a mixture of a catalyst in which a noble metal such as platinum is supported on porous carbon and a polymer electrolyte having hydrogen ion conductivity, and air permeability and electronic conductivity laminated on the catalyst layer. A gas diffusion layer having a property is provided. A pair of gaskets 31 and 32 for preventing gas mixing and leakage are respectively disposed around the anode 21 and the cathode 22, and a fuel gas containing at least hydrogen is supplied to and discharged from the anode 21, and at least oxygen is supplied to the cathode 22. Is sandwiched between a pair of conductive separator plates 41 and 42 having a gas flow path for supplying and discharging an oxidant gas containing.

  A stack obtained by stacking a plurality of single cells having the above configuration is referred to as a stack, and the single cell or stack is collectively referred to as a fuel cell 5.

  When the fuel gas and the oxidant gas are supplied to the anode 21 and the cathode 22, respectively, and an electronic load is connected, the hydrogen contained in the fuel gas supplied to the anode 21 releases electrons at the interface between the anode 21 and the electrolyte 1 to generate hydrogen. It becomes an ion (Chemical formula 1).

  The hydrogen ions move to the cathode 22 through the electrolyte 1, receive electrons at the interface between the cathode 22 and the electrolyte 1, react with oxygen contained in the oxidant gas supplied to the cathode 22, and generate water ( 2).

  The total reaction is shown in (Chemical Formula 3).

  At this time, the flow of electrons flowing through the electronic load can be used as DC electrical energy. Moreover, since a series of reactions are exothermic reactions, the reaction heat can be used as thermal energy.

  Further, when nitrogen oxide is present as an impurity in the oxidant gas, the output voltage of the fuel cell 5 is lowered. Therefore, it is necessary to remove nitrogen oxides that adversely affect the characteristics of the fuel cell 5 contained in the oxidant gas.

Conventionally, for example, a cleaning liquid tank provided with a cleaning liquid provided in an oxidant gas supply path is provided, and the oxidant gas is cleaned and supplied with the cleaning liquid (see Patent Document 1). Thereby, nitrogen oxides of impurities contained in the oxidant gas are removed and supplied to the fuel cell, so that it is possible to prevent deterioration of battery characteristics and life.
JP 2002-56877 A

  However, the conventional method for removing nitrogen oxides using the cleaning liquid tank has a problem that not only the apparatus is increased in size, but also it takes time to process the discharged cleaning liquid when the cleaning liquid is replaced. In addition, since the water pressure in the cleaning liquid tank is applied, the pressure loss in the cleaning liquid tank increases, and it is necessary to increase the supply pressure of air supply means such as a blower that supplies oxidant gas. It had problems such as decline.

  The present invention solves the above-mentioned conventional problems, and is provided with a nitrogen oxide removing means capable of removing nitrogen oxides of impurities contained in an oxidant gas without using a cleaning liquid tank. An object of the present invention is to provide a fuel cell power generator excellent in durability that suppresses a decrease in battery voltage due to oxides.

  In order to solve the above-described conventional problems, the fuel cell power generator of the present invention includes nitrogen oxide removing means for removing nitrogen oxide contained in the oxidant gas.

  Thereby, nitrogen oxides contained in the oxidant gas can be removed, and a decrease in battery voltage due to nitrogen oxides can be suppressed.

  As described above, according to the fuel cell power generation device of the present invention, nitrogen oxides contained in the oxidant gas can be removed with a relatively small configuration, and a decrease in the output voltage of the fuel cell is suppressed. be able to.

  In addition, since no liquid is used, maintenance such as replacement is improved and water pressure is not applied, so low pressure loss can be maintained, and the load on air supply means such as a blower is reduced, resulting in high efficiency. Noise reduction can be achieved, and a fuel cell power generator having excellent durability can be provided.

  According to a first aspect of the present invention, there is provided a nitrogen oxide removing means for removing nitrogen oxide contained in an oxidant gas containing at least oxygen, an electrolyte, a pair of electrodes sandwiching the electrolyte, and at least hydrogen in one of the electrodes. A fuel cell comprising at least one cell comprising a pair of separator plates having a gas flow path for supplying and discharging the fuel gas, and supplying and discharging the oxidant gas from which the nitrogen oxide has been removed, Since the nitrogen oxides of impurities present in the agent gas are removed by the nitrogen oxide removing means, it is possible to suppress a decrease in battery voltage due to nitrogen oxides.

  In the second invention, in particular, the nitrogen oxide removing means of the first invention is an activated carbon filter in which activated carbon is impregnated with an alkali that absorbs nitrogen oxide, and the alkali is attached to activated carbon having a large specific surface area. Can be increased, and the lifetime in which nitrogen oxides can be absorbed and removed can be extended.

  The third invention comprises an organic substance removing means comprising activated carbon that adsorbs organic substances, and an alkali removing means in which an acid that absorbs alkali is impregnated on the activated carbon, and an oxidant gas. Is passed through the nitrogen oxide removing means and then passed through the organic substance removing means and the alkali removing means to simultaneously adsorb and remove not only nitrogen oxides but also impurities such as organic substances and alkalis. The decrease can be suppressed.

  In addition, since the organic substance removing means and the alkali removing means are arranged after removing the nitrogen oxides, the amount of nitrogen dioxide reduced by the activated carbon can be reduced, and the activated carbon is less likely to be adsorbed and removed by the activated carbon than the nitrogen dioxide. Since the amount of nitric oxide is reduced, a decrease in battery voltage due to nitric oxide can be suppressed.

  In the fourth invention, in particular, the nitrogen oxide removing means of the first invention is an ion exchange resin to which an alkaline functional group is added, and nitrogen oxide is adsorbed and removed as nitrate ions, so that nitrogen dioxide and nitrogen monoxide are removed. Thus, a decrease in battery voltage due to nitrogen oxides can be suppressed.

  According to a fifth aspect of the present invention, in particular, in the first aspect of the invention, an ozone generator is provided, and nitrogen monoxide contained in the oxidant gas is oxidized with ozone to form nitrogen dioxide, which is circulated through the nitrogen oxide removing means. Since nitrogen monoxide, which is difficult to adsorb and remove as compared with, is previously oxidized to nitrogen dioxide with ozone, a decrease in battery voltage due to nitrogen oxides such as nitrogen monoxide and nitrogen dioxide can be suppressed.

  In a sixth aspect of the invention, in particular, in the first or fifth aspect of the invention, an ozone decomposing device is provided to remove ozone contained in the oxidant gas and to supply the fuel cell with ozone that affects the cell voltage. Since the oxidant gas is supplied after the removal, the oxygen concentration in the oxidant gas becomes constant, and the battery performance can be stabilized.

  In the seventh invention, in particular, the nitrogen oxide removing means of the first invention contains at least an inorganic peroxide or a permanganate, and nitrogen oxides such as nitrogen monoxide and nitrogen dioxide contained in the oxidizing gas. Is efficiently absorbed and removed as nitrate ions, so that a decrease in battery voltage due to nitrogen oxides can be suppressed.

  In the eighth invention, in particular, the nitrogen oxide removing means of the first invention includes a perovskite complex metal oxide having oxygen deficiency, and decomposes and removes nitrogen oxide contained in the oxidant gas into nitrogen and oxygen. Therefore, a decrease in battery voltage due to nitrogen oxides can be suppressed.

  According to a ninth invention, in particular, in the first invention, a photocatalyst is provided, and nitrogen monoxide contained in the oxidant gas is converted to nitrogen dioxide, which is circulated through the nitrogen oxide removing means. Nitrogen oxide is converted into nitrogen dioxide in advance, and nitrogen dioxide is efficiently removed by the nitrogen oxide removing means, so that a decrease in battery voltage due to nitrogen oxide can be suppressed.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiment.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a fuel cell power generator according to the present invention. In FIG. 1, reference numeral 1 denotes a membrane-shaped solid polymer electrolyte made of a perfluorocarbon sulfonic acid polymer having hydrogen ion conductivity. A pair of electrodes, an anode 21 and a cathode 22 are formed on both surfaces of the electrolyte 1. When the electrolyte 1 takes in moisture, the hydrogen ions of the sulfonic acid groups in the electrolyte 1 are dissociated to become charge carriers, and the electrolyte 1 passes through a reverse micelle structure formed by aggregation of several sulfonic acid groups. Shows hydrogen ion conductivity. Since the electrical conductivity of the electrolyte 1 decreases when the water content decreases, a method of preventing the drying of the electrolyte 1 by humidifying and supplying the gas was adopted.

  The anode 21 and the cathode 22 have a catalyst layer made of a mixture of a catalyst in which a noble metal such as platinum is supported on porous carbon and a polymer electrolyte having hydrogen ion conductivity, and air permeability and electronic conductivity laminated on the catalyst layer. It consists of a gas diffusion layer having properties. For the anode 21, an alloy catalyst such as platinum-ruthenium having CO resistance was used. Moreover, carbon paper or carbon cloth subjected to water repellent treatment was used for the gas diffusion layer.

  A pair of gaskets 31 and 32 for preventing gas mixing and leakage are disposed around the anode 21 and the cathode 22, respectively, and further, a gas for supplying and discharging fuel gas and oxidant gas to the anode 21 and the cathode 22, respectively. A pair of conductive separator plates 41 and 42 having a flow path was used to hold them. The voltage generated by the single cell configured as described above is about 0.75 V, and a plurality of single cells corresponding to the required voltage can be stacked in series to form a fuel cell with a desired output. it can.

  In addition, current collector plates, insulating plates, and end plates were disposed at both ends of the separator plates 41 and 42, and fixed with fastening rods. And it was set as the structure which can detect the voltage of a fuel cell when an electronic load and a voltage detection part are connected to the current collecting plate, and a fixed electric current is sent.

  The oxidant gas was taken in from the air from air supply means such as a fan, a pump and an air blower, and supplied to the cathode 22 of the fuel cell at a predetermined flow rate by the flow rate control means.

  The reducing gas contains nitrogen oxides such as nitrogen dioxide and nitrogen monoxide contained in exhaust gas from automobiles as impurities. Since the fuel cell power generator is installed in a general household, a store, a factory, etc., it is necessary to withstand even in such an environment.

  Therefore, the nitrogen oxide removing means 9 for removing nitrogen oxides of impurities contained in the oxidant gas is disposed between the air supply means and the cathode 22 inlet. A rough filter 8 for removing particulate matter such as dust contained in the reducing gas and particulate matter such as dust generated from the air supply means is provided in the upstream of the nitrogen oxide removing means 9. Further, downstream of the nitrogen oxide removing means 9, organic substances removing means 10 for removing organic substances such as toluene and methyl ethyl ketone which may be contained in the reducing gas, and alkaline impurities such as ammonia and trimethylamine are removed. Alkali removing means 11 was provided. Further, in the final flow, particulate matter such as dust contained in the reducing gas, particulate matter such as dust generated by the nitrogen oxide removing means 9, the organic matter removing means 10 and the alkali removing means 11 themselves are included. A dust removal filter 12 to be removed was arranged. These filters are housed in a housing and are piped to guide clean reducing gas to the cathode 22.

  The organic substance removing means 10 also functions as a spacer disposed between the strong alkaline nitrogen oxide removing means 9 and the strong acidic alkali removing means 11, and the nitrogen oxide removing means 9 and the alkali removing means 11. Since the acid and alkali are not brought into direct contact with each other, it is possible to prevent the acid and alkali from causing a neutralization reaction and deteriorating the mutual removal performance.

  The oxidant gas taken in from the atmosphere first passes through the coarse filter 8, then passes through the nitrogen oxide removing means 9, the organic matter removing means 10, the alkali removing means 11, and finally passes through the dust removing filter 12 to oxidize. The concentration of various impurities contained in the agent gas is reduced.

  As the coarse filter 8, a fiber made of polypropylene or the like was charged and then woven into a nonwoven fabric. The coarse filter 8 removes not only dust in which each of the charged fibers is contained in the oxidant gas, but also dust and particulate matter generated from the air supply means disposed in the previous stage. Further, not only the removal performance of the nitrogen oxide removing means 9 and the alkali removing means 11 is maintained, but the load on the dust removing filter 12 is reduced, so that the life of the dust removing filter 12 can be extended.

  The nitrogen oxide removing means 9 used calcium hydroxide as an alkali that absorbs nitrogen oxide, kneaded activated carbon and a curing agent, granulated, and then molded into a honeycomb type to obtain an activated carbon filter. Calcined gypsum was used as the curing agent. When calcined gypsum is mixed with water, it becomes calcium sulfate and hardens. Calcium hydroxide reacts with nitrogen dioxide as shown in (Chemical formula 4) to fix calcium nitrate on the nitrogen oxide removing means and chemically adsorb it.

  In addition, the alkali used for the nitrogen oxide removing means can remove not only nitrogen oxides but also acidic impurities such as hydrogen sulfide, sulfur dioxide, hydrogen chloride, hydrogen fluoride. Chemisorbs acidic impurities. For example, sulfur dioxide reacts as shown in (Chemical Formula 5) and is chemisorbed and fixed as calcium sulfate.

  Therefore, it is not simply adsorbed, but the acidic impurities and alkali are reacted and fixed on the nitrogen oxide removing means 9, so that the desorbed high-concentration acidic impurities are not desorbed depending on the concentration or temperature. It is possible to prevent the battery performance from being deteriorated by being mixed in the battery.

  In addition, since activated carbon having a large specific surface area is used, the amount attached to the pores can be increased, and the life in which nitrogen oxides can be absorbed and removed can be extended.

  Further, by adopting the honeycomb structure, the reaction area can be increased, the pressure loss of the introduced oxidant gas by the nitrogen oxide removing means 9 is reduced, and clogging of the nitrogen oxide removing means 9 is suppressed. Therefore, the load such as the air supply means is not affected, and the power generation efficiency can be kept high.

  The organic substance removing means 10 was formed into a corrugated structure using a fibrous activated carbon sheet. Since porous activated carbon is used, organic substances such as toluene, methyl ethyl ketone, and trichloroethylene can be adsorbed into the pores, and deterioration of battery performance due to these impurities can be suppressed.

  The alkali removing means 11 impregnated a fibrous activated carbon sheet with a phosphoric acid solution adjusted to a constant concentration as an absorbent for alkaline impurities, separated and dried, and further processed the sheet into a corrugated type. Phosphoric acid is fixed on the surface of the activated carbon fiber, and ammonium phosphate produced by reacting with an alkaline impurity such as ammonia as shown in (Chemical Formula 6) is fixed on the surface of the activated carbon fiber and chemically adsorbed.

  Therefore, since the impurities and the adhering substance are reacted and fixed on the alkali removing means 11 instead of simply adsorbing, the desorbed impurities are mixed into the fuel cell without being desorbed depending on the concentration or temperature. It is possible to prevent the performance from deteriorating.

  Further, by using fibrous activated carbon, not only can the weight be reduced, but the degree of freedom in shape and size can be increased, and breakage such as cracks and cracks can be eliminated. In addition, the reaction area can be increased by using a corrugated structure.

  Further, the pressure loss of the oxidant gas introduced by the organic substance removing means 10 and the alkali removing means 11 can be reduced, and clogging of the organic substance removing means 10 and the alkali removing means 11 is suppressed. The power generation efficiency can be kept high without being affected.

  The dust removal filter 12 was prepared by charging a fiber made of polypropylene or the like, and then increasing the basis weight of the coarse filter 8 to make a woven nonwoven fabric into a pleated shape and fixing it to a frame. Each electrostatically charged fiber attracts and adsorbs microscopic dust floating in the air by the action of Coulomb force and induced force, so it removes particulate matter such as dust in reducing gas and nitrogen oxides in the previous stage Particulate substances such as dust generated from the means 9, the organic substance removing means 10 and the alkali removing means 11 themselves can be efficiently removed.

  Various functional groups seem to be formed in the pores of the activated carbon, and depending on the type of the functional group, nitrogen dioxide in the nitrogen oxide may be reduced to nitric oxide. Since nitric oxide is less likely to be adsorbed by activated carbon than nitrogen dioxide, the amount of nitric oxide as small as possible has a smaller effect on the battery voltage.

  In the present embodiment, after removing the nitrogen oxides by the nitrogen oxide removing means 9, the organic matter removing means 10 and the alkali removing means 11 are arranged. Therefore, the activated carbon contained in the organic matter removing means 10 and the alkali removing means 11 is used. The amount of nitrogen dioxide to be reduced can be reduced, and the amount of nitric oxide that is difficult to be adsorbed and removed by activated carbon compared to nitrogen dioxide is reduced, so that a decrease in battery voltage due to nitric oxide can be suppressed.

  With the filter configuration described above, nitrogen oxides present in the oxidant gas are removed to prevent entry into the fuel cell 5, so that a decrease in battery voltage due to nitrogen oxides can be suppressed.

  Further, the ventilation resistance of the entire filter is very small, the pressure loss due to the filter is about 100 Pa, and the power generation efficiency can be kept high without affecting the load such as the air supply means.

  Using the fuel cell power generator configured as described above, the performance of various filters was confirmed.

First, a clean fuel gas containing no impurities in the anode 21 and a clean oxidant gas containing no impurities in the cathode 22 were humidified so that the dew points were 65 ° C. and 70 ° C., respectively, and supplied in predetermined amounts. The fuel gas contains about 20% carbon dioxide. Then, the cell temperature was about 70 ° C., the fuel gas utilization rate was about 75%, the oxidant gas utilization rate was about 40%, and a constant current of about 0.2 A / cm ^{2 was} applied to the electrode area by an electronic load. At this time, the battery voltage detected by the voltage detector connected to the fuel cell was stable at about 0.75V.

  Next, an oxidant gas added with 0.06 ppm of nitrogen dioxide was supplied to the cathode 22 and the same power generation test was conducted. As a result, the voltage gradually decreased while staggering, and after about 10 hours the battery voltage was 0.74 V. It dropped to.

  Next, nitrogen oxide removing means 9 was attached to the cathode 22 side, and a similar power generation test was conducted. As a result, the battery voltage did not decrease and showed a stable value without wobbling. The test results are shown in FIG. From these tests, it was found that the filter of the present embodiment efficiently removes impurities contained in the oxidant gas.

(Embodiment 2)
The feature of this embodiment is that the nitrogen oxide removing means 9 is an ion exchange resin provided with an alkaline functional group, and the other configuration is the same as that of the first embodiment.

  The ion exchange resin was molded so as to adsorb a functional group such as an amino group to a hydrophilic polymer and adsorb nitrate ions.

  According to the above configuration, since nitrogen oxides are adsorbed and removed as nitrate ions, a decrease in battery voltage due to nitrogen oxides such as nitrogen dioxide and nitrogen monoxide can be suppressed.

(Embodiment 3)
The feature of this embodiment is an ozone generator that includes an ozone generator, oxidizes nitrogen monoxide contained in an oxidant gas with ozone to form nitrogen dioxide, and removes it with nitrogen oxide removing means 9. This is that ozone remaining in the oxidant gas is removed and supplied to the fuel cell, and other configurations are the same as those in the first embodiment.

  According to the present embodiment, nitrogen monoxide, which is difficult to adsorb and remove compared with nitrogen dioxide, is oxidized to nitrogen dioxide with ozone in advance, so that the decrease in battery voltage due to nitrogen oxides such as nitrogen monoxide and nitrogen dioxide is suppressed. Can do.

  In addition, since the oxidant gas is supplied after removing ozone that affects the battery voltage, the oxygen concentration in the oxidant gas becomes constant, and the battery performance can be stabilized.

(Embodiment 4)
The feature of the present embodiment is that the nitrogen oxide removing means 9 includes at least an inorganic peroxide or a permanganate, and the other configuration is the same as that of the first embodiment.

  The inorganic peroxide is any of sodium peroxide, potassium peroxide, magnesium peroxide, calcium peroxide, and barium peroxide, and potassium permanganate is effective as the permanganate.

  Both are powerful adsorbents, solids that strongly oxidize substances such as nitric oxide, and efficiently absorb and remove nitrogen oxides such as nitrogen monoxide and nitrogen dioxide contained in the oxidant gas as nitrate ions. Therefore, a decrease in battery voltage due to nitrogen oxides can be suppressed.

(Embodiment 5)
The feature of the present embodiment is that the nitrogen oxide removing means 9 includes a perovskite-type composite metal oxide having oxygen vacancies, and the rest of the configuration is the same as that of the first embodiment.

  Perovskite complex metal oxides with oxygen vacancies incorporate nitrogen oxides into the lattice due to their structural features, and decompose and remove nitrogen oxides contained in the oxidant gas into nitrogen and oxygen. A decrease in battery voltage can be suppressed.

(Embodiment 6)
A feature of the present embodiment is that a photocatalyst is provided, and nitrogen monoxide contained in the oxidant gas is converted to nitrogen dioxide, which is circulated to the nitrogen oxide removing means, and the other configuration is the first embodiment. It is the same composition as.

  The photocatalyst is made of titanium oxide and is activated by light energy such as ultraviolet rays. As a result, it has a strong photocatalytic action and can efficiently adsorb and decompose nitrogen monoxide and the like.

  Therefore, according to the above configuration, nitrogen monoxide, which is less likely to be adsorbed than nitrogen dioxide, is converted into nitrogen dioxide in advance, and nitrogen dioxide is efficiently removed by the nitrogen oxide removing means 9. Can be suppressed.

  The fuel cell power generator of the present invention has an effect of suppressing deterioration due to nitrogen oxides of impurities contained in oxidant gas or improving durability, and is used for a power generator and a device using a polymer solid electrolyte membrane. Useful.

  Further, it is useful for a stationary fuel cell cogeneration system installed outdoors where nitrogen oxides may exist as impurities such as exhaust gas in the oxidant gas.

1 is a schematic configuration diagram of a fuel cell power generator according to Embodiment 1 of the present invention. Battery voltage characteristics of the device Schematic configuration diagram of a conventional fuel cell power generator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrolyte 5 Fuel cell 9 Nitrogen oxide removal means 10 Organic substance removal means 11 Alkali removal means 21 Electrode (anode)
22 electrode (cathode)
41, 42 Separator plate

Claims (9)

Nitrogen oxide removing means for removing nitrogen oxide contained in an oxidant gas containing at least oxygen, an electrolyte, a pair of electrodes sandwiching the electrolyte, and a fuel gas containing at least hydrogen supplied to one of the electrodes On the other hand, a fuel cell power generator comprising a fuel cell comprising at least one cell comprising a pair of separator plates having a gas flow path for supplying and discharging the oxidant gas from which the nitrogen oxide has been removed. 2. The fuel cell power generator according to claim 1, wherein the nitrogen oxide removing means is an activated carbon filter in which activated carbon is impregnated with an alkali that absorbs nitrogen oxides. An organic substance removing means comprising activated carbon that adsorbs organic substances; and an alkali removing means in which an activated carbon is adsorbed with an acid that absorbs alkali; after the oxidant gas is circulated through the nitrogen oxide removing means, the organic substance removing means and the organic substance removing means The fuel cell power generator according to claim 1 or 2, wherein the fuel cell power generator is circulated through the alkali removing means. The fuel cell power generator according to claim 1, wherein the nitrogen oxide removing means is an ion exchange resin to which an alkaline functional group is added. 2. The fuel cell power generator according to claim 1, further comprising an ozone generator, wherein nitrogen monoxide contained in the oxidant gas is oxidized with ozone to form nitrogen dioxide and is passed to the nitrogen oxide removing means. The fuel cell power generator according to claim 1 or 5, further comprising an ozonolysis device, supplying ozone to the fuel cell after removing ozone contained in the oxidant gas. The fuel cell power generator according to claim 1, wherein the nitrogen oxide removing means includes at least an inorganic peroxide or a permanganate. The fuel cell power generator according to claim 1, wherein the nitrogen oxide removing means includes a perovskite-type composite metal oxide having an oxygen deficiency. The fuel cell power generator according to claim 1, further comprising a photocatalyst, wherein nitrogen monoxide contained in the oxidant gas is converted to nitrogen dioxide and is circulated through the nitrogen oxide removing means.

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