JP4661054B2 - Fuel cell power generator - Google Patents

Description

  The present invention relates to a fuel cell power generation device that is intended to suppress deterioration due to impurities contained in fuel gas and 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. 5, 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.

  Next, the configuration and operation of a general fuel cell power generator including the fuel processing unit 7 will be described with reference to FIG. In FIG. 5, the raw material gas containing hydrocarbons, such as methane, is supplied to the desulfurization part 6, and the sulfur compound contained in an odorant etc. is adsorbed and removed (desulfurization). Then, it is reformed by the fuel processing unit 7 to become a fuel gas containing hydrogen, and is supplied to the anode 21 of the fuel cell 5. The fuel processing unit 7 includes a reforming unit 71 that reforms methane and the like, a CO conversion unit 72 that converts generated carbon monoxide (CO), and a CO removal unit 73 that further removes CO.

  When methane is used as the source gas, in the reforming unit 71, the reaction shown in (Chemical Formula 4) occurs with water vapor, and about 10% of CO is generated together with hydrogen.

  Thereafter, the generated CO is oxidized to carbon dioxide at the CO conversion section 72 as shown in (Chemical Formula 5), and is reduced to about 5000 ppm. Since the downstream CO remover 73 oxidizes not only CO but also hydrogen of the fuel gas, the CO concentration needs to be reduced as much as possible in the CO shift section 72.

  Further, the remaining CO is oxidized by the CO remover 73 as shown in (Chemical Formula 6), and its concentration is reduced to about 10 ppm or less.

  The overall reaction formula is shown in (Chemical Formula 7).

  Since platinum contained in the anode 21 is poisoned by CO in the operating temperature range of the fuel cell 5 and its catalytic activity deteriorates, a catalyst having CO resistance such as platinum-ruthenium is usually used for the anode 21. However, even in a CO-resistant catalyst, the CO concentration contained in the fuel gas must be suppressed to at least 10 ppm or less.

  Further, if impurities exist in the fuel gas or the oxidant gas, the output voltage of the fuel cell 5 decreases due to the impurities. For example, when sulfur compounds such as sulfur dioxide contained in exhaust gas and hydrogen sulfide contained in a lot of hot springs are mixed as impurities, platinum contained in the anode 21 or the cathode 22 is poisoned and the catalytic activity is deteriorated. Resulting in. Moreover, when ammonia which is a bad odor is mixed, the acidic electrolyte is neutralized and the ionic conductivity of the electrolyte is lowered. In some cases, ammonia is synthesized from nitrogen by a reforming reaction and mixed when reforming the fuel processing unit 7 using a raw material gas containing nitrogen as well as from the atmosphere. Therefore, it is necessary to remove impurities that adversely affect the characteristics of the fuel cell 5 contained in the fuel gas or oxidant gas.

Conventionally, for example, an ammonia removal device that removes ammonia in fuel gas and an ammonia removal device that removes ammonia in oxidant gas have been provided to remove ammonia in fuel gas and oxidant gas (Patent Literature). 1). Thereby, even if ammonia is contained in fuel gas and oxidant gas, since ammonia is removed , it can suppress that an output voltage falls by ammonia.
JP-A-6-84537

However , if an adsorbent such as zeolite or activated carbon that uses an adsorption action is used in the ammonia removal device, the life of the adsorbent is significantly shortened when exposed to high concentrations of ammonia, and the adsorbent is used to ensure the life. Increasing the volume of the apparatus causes problems such as an increase in the size of the apparatus.

The present invention is the one that solves the conventional problems, by providing a fuel gas or oxidant gas impurity removing means for removing ammonia which any alkaline impurities that may be present in or reformed gas atmosphere An object of the present invention is to provide a fuel cell power generator excellent in durability that prevents poisoning of a catalyst due to alkaline impurities and a decrease in ion conductivity and suppresses a decrease in battery voltage.

In order to solve the conventional problems, a fuel cell power generator of the present invention includes a fuel processing unit that generates a fuel gas containing at least hydrogen and carbon dioxide using a raw material gas and water,
At least one diaphragm is provided , fuel gas or oxidant gas is supplied to and discharged from one of the diaphragms , and an acidic solution containing water and carbon dioxide is supplied to and discharged from the other, and the fuel gas or oxidant gas is supplied through the diaphragm. Fuel gas or oxidant gas impurity removing means for removing water-soluble alkaline impurities contained therein ,
At least one having an electrolyte, a pair of electrodes sandwiching the electrolyte, and a pair of separator plates having a gas flow path for supplying and discharging fuel gas to one of the electrodes and supplying and discharging an oxidant gas containing at least oxygen to the other A fuel cell with two cells;
Condensing means for condensing an acidic solution containing water and carbon dioxide from off-gas of a fuel cell fuel cell or exhaust gas from a fuel processing unit and supplying the acidic solution to an impurity removing means .

Thus, the water-soluble alkaline impurities contained in the fuel gas or oxidant gas can be stably removed for a long period of time, preventing poisoning and the catalyst by an alkaline impurities, a reduction in the ionic conductivity, the battery A decrease in voltage can be suppressed.

As described above, according to the fuel cell power generation device of the present invention, alkaline impurities that may be present in the atmosphere or reformed gas are stably removed over a long period of time . It is possible to provide a fuel cell power generator that can suppress the decrease and has excellent durability.

A fuel cell power generator according to a first aspect of the present invention includes a fuel processing unit that generates a fuel gas containing at least hydrogen and carbon dioxide using raw material gas and water;
And having at least one diaphragm, supplying and discharging the fuel gas to one of the diaphragms, supplying and discharging an acidic solution containing at least water and carbon dioxide to the other, and being included in the fuel gas through the diaphragm A fuel gas impurity removing means for removing water-soluble alkaline impurities,
A pair of separators having an electrolyte, a pair of electrodes sandwiching the electrolyte, and a gas flow path for supplying and discharging the fuel gas from which impurities are removed to one of the electrodes and supplying and discharging an oxidizing gas containing at least oxygen to the other A fuel cell comprising at least one cell having a plate;
Condensing means for condensing the acidic solution containing water and carbon dioxide from off-gas of the fuel cell of the fuel cell or exhaust gas of the fuel processing unit, and supplying the acidic solution to the fuel gas impurity removing means . By removing the ammonia which any alkaline impurities contained in the fuel gas, poisoning and of the catalyst by an alkaline impurities, prevent a decrease in ionic conductivity, it is possible to suppress a decrease in the battery voltage.

A fuel cell power generation device according to a second aspect of the present invention is a fuel processing unit that generates a fuel gas containing at least hydrogen and carbon dioxide using raw material gas and water;
Having at least one diaphragm, supplying and discharging an oxidizing gas containing at least oxygen to one of the diaphragms, supplying and discharging an acidic solution containing at least water and carbon dioxide to the other, and passing the oxidizing gas through the diaphragm; Oxidant gas impurity removing means for removing water-soluble alkaline impurities contained in the agent gas;
A pair of separators having an electrolyte, a pair of electrodes sandwiching the electrolyte, and a gas flow path for supplying and discharging a fuel gas containing at least hydrogen to one of the electrodes and supplying and discharging the oxidant gas from which impurities are removed A fuel cell comprising at least one cell having a plate;
Condensation means for condensing the acidic solution containing water and carbon dioxide from off-gas of the fuel cell of the fuel gas or exhaust gas of the fuel processing unit, and supplying the acidic solution to the oxidant gas impurity removing means; Prepare. By removing the ammonia which any alkaline impurities contained in the oxidant gas, poisoning and of the catalyst by an alkaline impurities, prevent a decrease in ionic conductivity, it is possible to suppress a decrease in the battery voltage.

A fuel cell power generation device according to a third aspect of the present invention is a fuel processing unit that generates a fuel gas containing at least hydrogen and carbon dioxide using raw material gas and water;
Having at least one first diaphragm, supplying and discharging the fuel gas to one of the first diaphragms, supplying and discharging an acidic solution containing at least water and carbon dioxide to the other, through the first diaphragm, Fuel gas impurity removing means for removing water-soluble alkaline impurities contained in the fuel gas;
Having at least one second diaphragm, supplying and discharging an oxidant gas containing at least oxygen to one of the second diaphragms, and supplying and discharging an acidic solution containing at least water and carbon dioxide to the other; An oxidant gas impurity removing means for removing water-soluble alkaline impurities contained in the oxidant gas,
A pair of electrodes having an electrolyte, a pair of electrodes sandwiching the electrolyte, and a gas flow path for supplying and discharging the fuel gas from which impurities are removed to one of the electrodes, and supplying and discharging the oxidant gas from which impurities are removed to the other A fuel cell comprising at least one cell having a separator plate;
The acidic solution containing water and carbon dioxide is condensed from off-gas of the fuel cell of the fuel cell or exhaust gas of the fuel processing unit, and the acidic solution is used as the fuel gas impurity removing unit and the oxidant gas impurity removing unit. Supplying condensation means;
Is provided. By removing the ammonia which any alkaline impurities contained in the fuel gas or oxidant gas, poisoning and of the catalyst by an alkaline impurities, prevent a decrease in ionic conductivity, it is possible to suppress a decrease in the battery voltage.

Further, the first to third invention, humidified with a condensable means that is condensed off-gas from the fuel cell of the fuel gas, the fuel gas impurity removing means condensed water condensable means or oxidant gas impurities By supplying and discharging to the removal means, water-soluble alkaline impurities contained in the fuel gas or oxidant gas are dissolved in the water condensed from the off-gas from the fuel cell and stably removed over a long period of time through the diaphragm. Can Further , water can be effectively used in the entire fuel cell power generation apparatus, which is economical.

Further, the first to third invention, provided with a condensable means that to condense the exhaust gas of the fuel processing unit, that the condensed water condensable means for supplying discharged into the fuel gas impurity removing means or the oxidant gas impurity removing means Thus, the water-soluble alkaline impurities contained in the fuel gas or the oxidant gas can be dissolved in the water condensed from the exhaust gas of the fuel processing section and stably removed over a long period of time through the diaphragm . Further , water can be effectively used in the entire fuel cell power generation apparatus, which is economical.

  The fuel gas impurity removing means or the oxidant gas impurity removing means of the first to third inventions
By supplying and discharging the acidic solution, alkaline impurities such as ammonia can be stably removed over a long period of time as compared with the case where simple water is used.

Fourth and fifth invention comprises the ion exchange resin unit, an acidic solution containing the impurities is discharged from the fuel gas impurity removing means or the oxidant gas impurity removing means, flowed through the ion exchange resin unit The liquid can be regenerated by removing alkaline impurities . Thereby , the water supplied to the fuel gas impurity supply means or the oxidant gas impurity removal means can be circulated, and the impurities are dissolved and removed in this water, so that the entire fuel cell power generation apparatus effectively uses water. Can be economical.

A sixth invention and the seventh is equipped with activated carbon filters, an acidic solution containing the alkaline impurities which are discharged from the fuel gas impurity removing means or the oxidant gas impurity removing means may flow through the activated carbon filter, alkaline The liquid can be regenerated by removing impurities . Thereby , the water supplied to the fuel gas impurity removing means or the oxidant gas impurity supplying means can be circulated, and the impurities are dissolved and removed in this water, so that the entire fuel cell power generator effectively uses water. Can be economical.

  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, and 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 film by supplying the gas with humidification 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 for preventing gas mixing and leakage are arranged around the anode 21 and the cathode 22, respectively, and further, gas flow paths for supplying and discharging fuel gas and oxidant gas to the anode 21 and the cathode 22, respectively. The pair of conductive separator plates 41 and 42 having the pair was sandwiched. 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.

  Further, since the fuel cell generates heat during power generation, cooling water is supplied from the cooling water inlet 81, the fuel cell is cooled, and discharged from the cooling water outlet 82.

  The oxidant gas was taken in from the atmosphere by a fan or the like and supplied to the cathode 22 of the fuel cell at a predetermined flow rate by the flow rate control means.

  In this example, city gas 13A which has methane, ethane, propane, and butane as main ingredients was used as source gas. The desulfurized raw material gas is supplied to the fuel processing unit together with water, and a fuel gas containing hydrogen is generated by a reforming reaction. The fuel processing unit includes a reforming unit that reforms methane and the like, a CO conversion unit that converts generated CO, and a CO removal unit that removes CO. When air (nitrogen) is contained as an impurity in the raw material gas, ammonia may be synthesized from nitrogen by the reforming reaction and mixed into the fuel gas when reforming in the fuel processing unit.

  In addition, the fuel gas contains a large amount of carbon dioxide produced by the reforming reaction, and the carbon dioxide itself is inert to the fuel cell, but carbon dioxide produces carbon monoxide by the shift reaction. Therefore, it is necessary to remove carbon dioxide or reduce its concentration.

  Moreover, when the desulfurization of the raw material gas is insufficient due to breakage of the desulfurization part, sulfur dioxide is synthesized by combustion and may be mixed into the fuel gas.

  Further, nitrogen dioxide may be mixed into the fuel gas by combustion.

  Therefore, in order to remove these impurities, the fuel gas impurity removing means 9 is provided on the fuel gas side. The generated fuel gas is supplied to the anode 21 of the fuel cell via the fuel gas impurity supply means 9 at a predetermined flow rate by the flow rate control means. The fuel gas impurity removing means 9 has a plurality of diaphragms 10, supplies and discharges fuel gas that may contain impurities to the inside 101 of the diaphragm 10, and a liquid such as water on the outside 102 of the diaphragm 10. Can be supplied and discharged.

The fuel gas impurity removing means 9 used in the present embodiment is a method of efficiently separating and collecting only gas components by utilizing a difference in diffusion coefficient between gas and particles by a diffusion scrubber method. A porous Teflon (registered trademark) film (pore diameter Φ0.1 μm, porosity 70%, film thickness 0.1 mm) is used for the diaphragm 10 of the fuel gas impurity removing means 9, and the diaphragm 10 is provided on both of the 150 mm square frames. The fuel gas impurity removing means 9 was configured by stacking about 10 stages of mounted units at intervals of 5 mm. The porous Teflon (registered trademark) membrane is a water-repellent Teflon (registered trademark) membrane with fine holes, and does not allow liquids such as water having a large surface tension to pass therethrough, but gas passes through the holes of the diaphragm 10. Easy to penetrate. Water-soluble impurity gas components, ammonia, sulfur dioxide, nitrogen dioxide, carbon dioxide, etc. contained in the fuel gas supplied to the diaphragm 10 diffuse and permeate the diaphragm 10, and are trapped in a liquid such as water on the opposite side. Be collected. On the other hand, particles having a large diffusion constant pass through the diaphragm 10 as they are.

  Further, it has been found that the fuel gas impurity removing means 9 has very little ventilation resistance and can process fuel gas of about 0.1 to 0.5 m / sec.

  Using the fuel cell power generator configured as described above, the performance of the fuel gas impurity removing means 9 was examined.

First, as a comparative example, 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, when a fuel gas added with 1 ppm of ammonia was supplied to the anode 21 and a similar power generation test was performed, the battery voltage dropped to 0.74 V after about 10 hours. When the addition of ammonia was interrupted, the cell voltage slightly recovered, but did not return to 0.75 V during normal operation, indicating that ammonia gave irreversible deterioration to the fuel cell.

  Next, when the fuel gas impurity removing means 9 is attached to the anode 21 side and fuel gas added with 1 ppm of ammonia is supplied and the same power generation test is performed, the battery voltage does not decrease and shows a stable value. It was. From these tests, it has been found that the fuel gas impurity removing means 9 of this embodiment efficiently removes ammonia.

  Similarly, as a result of conducting a power generation test on sulfur dioxide, nitrogen dioxide and a mixed system thereof, it was found that the battery voltage was stably generated without lowering.

  Further, when the fuel gas impurity removing means 9 was attached, the battery voltage slightly increased and showed a stable value as compared with the case without the fuel gas impurity removing means 9. This is considered to be because the partial pressure of hydrogen was increased by removing carbon dioxide contained in the fuel gas by the fuel gas impurity removing means 9. Since the concentration of carbon dioxide is reduced, CO generated by the shift reaction can be reduced.

  Therefore, the fuel gas impurity removing means 9 of this embodiment suppresses the poisoning of the catalyst by impurities such as ammonia, sulfur dioxide, nitrogen dioxide and carbon dioxide and the decrease in ionic conductivity, and the durability of the fuel cell power generator. Can be improved.

(Embodiment 2)
FIG. 2 is a schematic configuration diagram of a fuel cell power generator according to Embodiment 2 of the present invention. In FIG. 2, the difference from the first embodiment is that an oxidant gas impurity removing means 11 for removing impurities contained in the oxidant gas is provided instead of the fuel gas. Other configurations are the same as those in the first embodiment.

  In the air, ammonia, hydrogen sulfide, sulfur dioxide contained in exhaust gas from automobiles, nitrogen dioxide, hydrogen chloride discharged from factories, hydrogen fluoride, etc. are contained in garbage, toilets, hospitals, etc. Contains various impurities such as water-soluble gas, water-soluble volatile organic compounds (VOC) such as formaldehyde and acetaldehyde contained in building materials and adhesives, and carbon dioxide that produces CO by shift reaction There is a possibility. Since the fuel cell power generator is installed in a general household, a store, a factory, etc., it must withstand even in such an environment.

  Therefore, oxidant gas impurity removing means 11 for removing these impurities is provided. The oxidant gas is supplied to the cathode 22 of the fuel cell via the oxidant gas impurity removal unit 11 at a predetermined flow rate by the flow rate control unit. The oxidant gas impurity removing means 11 has a plurality of diaphragms 12 as in the first embodiment, and supplies and discharges an oxidant gas that may contain impurities to the inside 121 of the diaphragm 12. In addition, a liquid such as water can be supplied to and discharged from the outside of the diaphragm 12. Water-soluble impurity gas components that may be contained in the oxidant gas supplied to the diaphragm 12, water-soluble gases such as ammonia, hydrogen sulfide, sulfur dioxide, nitrogen dioxide, hydrogen chloride, hydrogen fluoride, formaldehyde, Water-soluble volatile organic compounds (VOC) such as acetaldehyde and carbon dioxide that generates CO by a shift reaction can be collected.

  Further, it was found that the oxidant gas impurity removing means 11 has very little ventilation resistance and can treat an oxidant gas of about 0.1 to 0.5 m / sec.

  Using the fuel cell power generator configured as described above, the performance of the oxidant gas impurity removing means 11 was examined.

  When an oxidant gas added with 1 ppm of sulfur dioxide was supplied to the cathode 22 and a power generation test similar to that of Embodiment 1 was performed, the battery voltage dropped to 0.74 V in about 10 hours. Even when the addition of sulfur dioxide was interrupted, the cell voltage did not recover, and it was found that sulfur dioxide caused irreversible deterioration of the fuel cell. This is because sulfur compounds such as sulfur dioxide and hydrogen sulfide are strongly adsorbed with platinum contained in the catalyst, so that the catalyst is poisoned and its activity is reduced.

  Next, the oxidant gas impurity removing means 11 was attached to the cathode 22 side, the oxidant gas added with 1 ppm of sulfur dioxide was supplied, and the same power generation test was conducted. As a result, the battery voltage was stable without decreasing. The value is shown. From these tests, it was found that the oxidant gas impurity removing means 11 of this example efficiently removed sulfur dioxide.

  Similarly, as a result of conducting the same power generation test on ammonia, hydrogen sulfide, nitrogen dioxide, hydrogen chloride, hydrogen fluoride, formaldehyde, acetaldehyde, and carbon dioxide with the oxidant gas impurity removing means 11 attached, the battery It was found that the power generation was stable without voltage drop.

  Therefore, the oxidant gas impurity removing means 11 of the present embodiment can suppress the poisoning of the catalyst by water-soluble impurities and the decrease in ionic conductivity, and can improve the durability of the fuel cell power generator.

(Embodiment 3)
FIG. 3 is a schematic configuration diagram of a fuel cell power generator according to Embodiment 3 of the present invention. In FIG. 3, the difference from the first embodiment is that not only the fuel gas impurity removing means 9 but also the oxidant gas impurity removing means 11 is provided. Other configurations are the same as those in the first embodiment.

  The fuel gas is supplied to the anode 21 of the fuel cell via the fuel gas impurity supply means 9 at a predetermined flow rate by the flow rate control means. The fuel gas impurity removing means 9 has a plurality of first diaphragms 30, and supplies and discharges fuel gas that may contain impurities to the inner side 101 of the first diaphragm 30. In the structure, water and other liquids can be supplied and discharged.

  The oxidant gas is supplied to the cathode 22 of the fuel cell via the oxidant gas impurity removing unit 11 at a predetermined flow rate by the flow rate control unit. The oxidant gas impurity removing means 11 has a plurality of second diaphragms 31, and supplies and discharges an oxidant gas that may contain impurities to the inside 121 of the second diaphragm 31. The structure is such that liquid such as water can be supplied and discharged to the outside.

  Also, an ion exchange resin means and an activated carbon filter, wherein the liquid containing impurities discharged from the fuel gas impurity removal means or the oxidant gas impurity removal means flows through the ion exchange resin means and the activated carbon filter. did.

According to the present embodiment, clean fuel gas and oxidant gas from which water-soluble impurities that may be contained in the fuel gas and oxidant gas are removed are supplied to the fuel cell. Therefore, it is possible to provide a fuel cell power generator that is more durable.

  Further, by removing impurities with an ion exchange resin means or an activated carbon filter to regenerate the liquid, water supplied to the fuel gas impurity supply means 9 or the oxidant gas impurity removal means 11 can be circulated. Since the impurities are dissolved and removed, water can be effectively used in the entire fuel cell power generator, which is economical.

(Embodiment 4)
FIG. 4 is a schematic configuration diagram of a fuel cell power generator according to Embodiment 4 of the present invention. In FIG. 4, the difference from the third embodiment is that it is a liquid such as water that dissolves impurities through the first diaphragm 30 or the second diaphragm 31 of the fuel gas impurity removing means 9 or the oxidant gas impurity removing means 11. The cooling water for cooling the fuel cell is used.

  According to the present invention, water can be effectively used in the entire fuel cell power generator, which is economical.

  In addition to the fuel cell cooling water, the fuel cell off-gas condensing means for condensing the off-gas from the fuel cell of the humidified fuel gas or oxidant gas is provided, and the water condensed by the fuel cell off-gas condensing means is removed by the fuel gas impurities. Even when the supply to the means 9 or the oxidant gas impurity removal means 11 is performed, water can be effectively used in the entire fuel cell power generation apparatus, which is economical.

  Alternatively, a fuel processing unit that generates fuel gas and an exhaust gas condensing unit that condenses the exhaust gas of the fuel processing unit are provided, and the water condensed by the exhaust gas condensing unit 9 is the fuel gas impurity removing unit 9 or the oxidant gas impurity removing unit 11. Even when the fuel is supplied and discharged, water can be effectively used in the entire fuel cell power generation apparatus, which is economical.

  Further, by supplying and discharging the acidic solution to the fuel gas impurity removing unit 9 or the oxidant gas impurity removing unit 11, alkaline impurities such as ammonia can be stably removed over a long period of time as compared with the case where simple water is used. be able to.

  In addition, by supplying and discharging an alkaline solution to the fuel gas impurity removing means 9 or the oxidant gas impurity removing means 11, hydrogen sulfide, sulfur dioxide, nitrogen dioxide, hydrogen chloride, fluoride can be obtained as compared with the case where simple water is used. Acidic impurities such as hydrogen and carbon dioxide can be stably removed over a long period of time.

  Further, when the fuel gas impurity removing unit 9 or the oxidant gas impurity removing unit 11 is configured by a first impurity removing unit that supplies and discharges an acidic solution and a second impurity removing unit that supplies and discharges an alkaline solution, Acidic impurities can be removed at the same time, catalyst poisoning due to these impurities and ionic conductivity can be prevented from decreasing, and a fuel cell power generator excellent in durability that suppresses a decrease in battery voltage can be obtained.

  The fuel cell power generator of the present invention has an effect of suppressing deterioration due to impurities or improving durability, and is useful for a power generator and a device using a polymer solid electrolyte membrane.

  Moreover, it is useful for a stationary fuel cell cogeneration system installed outdoors where impurities such as bad odor and exhaust gas may exist.

1 is a schematic configuration diagram of a fuel cell power generator according to Embodiment 1 of the present invention. Schematic configuration diagram of a fuel cell power generator according to Embodiment 2 of the present invention Schematic configuration diagram of a fuel cell power generator according to Embodiment 3 of the present invention Schematic configuration diagram of a fuel cell power generator according to Embodiment 4 of the present invention Schematic configuration diagram of a conventional fuel cell power generator

DESCRIPTION OF SYMBOLS 1 Electrolyte 9 Fuel gas impurity removal means 10, 12 Diaphragm 11 Oxidant gas impurity removal means 21 Electrode (anode)
22 electrode (cathode)
30 1st diaphragm 31 2nd diaphragm 41, 42 Separator plate

Claims (8)

A fuel processing unit that generates a fuel gas containing at least hydrogen and carbon dioxide using raw material gas and water;
Having at least one membrane, the fuel gas is supplied discharged to one of said diaphragm, and supply and discharge an acidic solution containing at least water and carbon dioxide on the other, through the diaphragm, contained in the fuel gas A fuel gas impurity removing means for removing water-soluble alkaline impurities,
A pair of separators having an electrolyte, a pair of electrodes sandwiching the electrolyte, and a gas flow path for supplying and discharging the fuel gas from which impurities are removed to one of the electrodes and supplying and discharging an oxidizing gas containing at least oxygen to the other a fuel cell comprising at least one cell that Yusuke and the plate, and
Condensing means for condensing the acidic solution containing water and carbon dioxide from off-gas of the fuel cell of the fuel cell or exhaust gas of the fuel processing unit, and supplying the acidic solution to the fuel gas impurity removing means;
Ru with a fuel cell power plant. A fuel processing unit that generates a fuel gas containing at least hydrogen and carbon dioxide using raw material gas and water;
Having at least one diaphragm , supplying and discharging an oxidizing gas containing at least oxygen to one of the diaphragms , supplying and discharging an acidic solution containing at least water and carbon dioxide to the other, and passing the oxidizing gas through the diaphragm; Oxidant gas impurity removing means for removing water-soluble alkaline impurities contained in the agent gas;
A pair of separators having an electrolyte, a pair of electrodes sandwiching the electrolyte, and a gas flow path for supplying and discharging a fuel gas containing at least hydrogen to one of the electrodes and supplying and discharging the oxidant gas from which impurities are removed A fuel cell comprising at least one cell having a plate ;
Condensing means for condensing the acidic solution containing water and carbon dioxide from off-gas of the fuel cell of the fuel cell or exhaust gas of the fuel processing unit, and supplying the acidic solution to the oxidant gas impurity removing means;
Ru with a fuel cell power plant. A fuel processing unit that generates a fuel gas containing at least hydrogen and carbon dioxide using raw material gas and water;
At least one first diaphragm, the fuel gas and the supply and discharge, an acidic solution containing at least water and carbon dioxide by supplying the discharge to the other, through the first diaphragm to one of said first diaphragm, Fuel gas impurity removing means for removing water-soluble alkaline impurities contained in the fuel gas;
Having at least one second diaphragm , supplying and discharging an oxidant gas containing at least oxygen to one of the second diaphragms , and supplying and discharging an acidic solution containing at least water and carbon dioxide to the other; An oxidant gas impurity removing means for removing water-soluble alkaline impurities contained in the oxidant gas,
A pair of electrodes having an electrolyte, a pair of electrodes sandwiching the electrolyte, and a gas flow path for supplying and discharging the fuel gas from which impurities are removed to one of the electrodes, and supplying and discharging the oxidant gas from which impurities are removed to the other A fuel cell comprising at least one cell having a separator plate ;
The acidic solution containing water and carbon dioxide is condensed from off-gas of the fuel cell of the fuel cell or exhaust gas of the fuel processing unit, and the acidic solution is used as the fuel gas impurity removing unit and the oxidant gas impurity removing unit. Supplying condensation means;
Ru with a fuel cell power plant. An ion exchange resin means is provided, and the acidic solution containing alkaline impurities discharged from the fuel gas impurity removal means is passed through the ion exchange resin means to remove the alkaline impurities and regenerate the acidic solution. The fuel cell power generator according to claim 1 or 3 . An ion exchange resin means is provided, and the acidic solution containing alkaline impurities discharged from the oxidant gas impurity removal means is passed through the ion exchange resin means to remove the alkaline impurities and remove the acidic solution. The fuel cell power generator according to claim 2 or 3 to be regenerated . The activated carbon filter is provided, and the acidic solution containing alkaline impurities discharged from the fuel gas impurity removing means is passed through the activated carbon filter to remove the alkaline impurities and regenerate the acidic solution. Or the fuel cell power generator of 3 . An activated carbon filter, wherein the acidic solution containing alkaline impurities discharged from the oxidant gas impurity removing means is passed through the activated carbon filter to remove the alkaline impurities and regenerate the acidic solution. 4. The fuel cell power generator according to 2 or 3 . The fuel cell power generator according to any one of claims 4 to 7, wherein the acidic solution is circulated after being regenerated .