JP2012221674A - Fuel cell system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell system capable of satisfying a drainage standard with a simple constitution.SOLUTION: Power is generated on a fuel cell 22 under air supplied from an air supply device 23 and fuel supplied from a hydrogen generation device 24. Condensed water recovered from combustion exhaust gas exhausted from the hydrogen generation device 24 via a combustion exhaust gas condenser 27 passes through a base type anion exchanger 21 arranged in a first condensed water passage 215, and then, is stored in a recovery water tank 28. When the condensed water passes through the base type anion exchanger 21, anions in the condensed water are exchanged with hydroxide ions, and the generated hydroxide ions are chemically reacted with hydrogen ions contained in the recovery water stored in the recovery water tank 28, so as to neutralize the recovery water. The surplus recovery water in the recovery water tank 28 is drained from a drainage port 212 of the recovery water tank 28, so as to constitute a fuel cell system 20 satisfying a drainage standard.

Description

  The present invention relates to a fuel cell system.

  The fuel cell system is a system that generates electric power by using oxygen in the air and hydrogen obtained by reforming a raw material gas such as city gas with a hydrogen generator to extract electric power.

  Conventionally, such a fuel cell system is included in the combustion exhaust gas obtained by burning the water vapor contained in the fuel exhaust gas discharged from the fuel cell and the raw material gas or the fuel exhaust gas discharged from the fuel cell in the hydrogen generator. Condensed water obtained by condensing water vapor is once stored in a recovered water tank as recovered water. Then, from the recovered water tank, the recovered water is sent to an ion removing device using a water supply means such as a pump, and after deionization treatment, it is used as water for generating hydrogen used for fuel cell and its power generation, The recovered water surplus at that time was neutralized in a neutralization tank and then drained outside the fuel cell system (for example, Patent Document 1).

  Hereinafter, a conventional fuel cell system disclosed in Patent Document 1 will be described with reference to the drawings.

  FIG. 7 is a configuration diagram showing an outline of a conventional fuel cell system disclosed in Patent Document 1. In FIG.

As shown in FIG. 7, the fuel cell system 70 includes a fuel cell 72, an air supply device 73, a hydrogen generator 74, a fuel exhaust gas condenser 76, a combustion exhaust gas condenser 77, and an interior of the hydrogen generator 74. The main component is a combustion section 75, a recovered water tank 78, and a neutralization tank 79 for neutralizing the recovered water remaining in the recovered water tank 78.
Here, the air supply device 73 supplies air to the fuel cell 72, and the hydrogen generation device 74 generates fuel gas to be supplied to the fuel cell 72. The fuel exhaust gas condenser 76 condenses water vapor contained in the fuel exhaust gas discharged from the fuel cell 72 to generate fuel exhaust gas condensed water. Similarly, the combustion exhaust gas condenser 77 condenses the water vapor contained in the combustion exhaust gas obtained by burning the raw material gas and the fuel exhaust gas discharged from the fuel cell in the hydrogen generator 74 to generate combustion exhaust gas condensed water. .

  The fuel exhaust gas condensed water and the combustion exhaust gas condensed water are sent to the recovered water tank 78 as recovered water, and the recovered water remaining in the recovered water tank 78 is sent to the neutralization tank 79. The recovered water stored in the recovered water tank 78 is sent to the ion removing device 714 by the water pump 713, purified, and then sent to the fuel cell 72 and the hydrogen generator 74.

The neutralization tank 79 has a bubbling tank 711 equipped with a bubbling device 710 for sending air to the recovered water, and a neutralizer tank 712 equipped with a neutralizing agent mainly composed of an aqueous carbonate solution such as calcium carbonate. Configured. Here, the recovered water is bubbled in the bubbling tank 711 by the air supplied by the bubbling device 710, and after processing for reducing carbon dioxide from the recovered water is performed, the recovered water is sent to the neutralizer tank 712. An aqueous solution of carbonate such as calcium carbonate is mainly fed into the neutralizer tank 712 via a pipe and a solenoid valve, and the carbonate and carbon dioxide contained in the recovered water are ionized in the recovered water. By chemically reacting with the generated hydrogen ions, the concentration of hydrogen ions in the recovered water is reduced, and the recovered water is neutralized. At this time, surplus recovered water in the neutralizer tank 712 is removed from the neutralizer tank 71.
The water is drained from the second drain port 71.

JP 2004-172016 A

  However, in the conventional configuration according to Patent Document 1, it is necessary to configure a neutralization tank by having a bubbling tank having a bubbling device and a neutralizing agent tank having a neutralizing agent. There was a problem that the volume increased. In addition, air used for bubbling is supplied to the bubbling tank, and the neutralizing agent tank is fed with the neutralizing agent, so members such as piping and solenoid valves are necessary, and their arrangement becomes complicated. There was a problem that the control of the solenoid valve was complicated. Furthermore, if the neutralization treatment in the neutralization tank is incomplete, a large amount of hydrogen ions will be present in the excess recovered water, the pH of the wastewater will shift to the acidic side, and the wastewater will be drained from the fuel cell system. However, there was a problem that the wastewater standard (drainage pH 5.8 to 8.6) was not satisfied.

  The present invention solves the above-described conventional problems, and provides a means for reliably reducing the hydrogen ion concentration contained in the recovered water stored in the recovered water tank with a simple configuration, and satisfies the drainage standard. It aims at realizing.

  In order to solve the conventional problems, a fuel cell system of the present invention includes a fuel cell, a combustor, a combustion exhaust gas condenser that recovers first condensed water from combustion exhaust gas discharged from the combustor, A recovered water tank that stores the first condensed water, an ion removing device that deionizes and purifies the recovered water stored in the recovered water tank, and a first condensing unit that connects the combustor and the recovered water tank. A basic anion exchanger disposed in a water flow path, wherein the first condensed water is recovered by exchanging anions in the first condensed water with hydroxide ions in the basic anion exchanger. It is configured to be sent to a water tank.

  Thereby, the anion contained in the 1st condensed water collect | recovered from the combustion exhaust gas discharged | emitted from a combustor is replaced | exchanged for a hydroxide ion by a base type anion exchanger, and the exchanged hydroxide ion is carried out. Since the concentration of hydrogen ions in the recovered water decreases due to a chemical reaction between the hydrogen ions in the recovered water stored in the recovered water tank, the pH of the wastewater discharged from the fuel cell system is maintained at the drainage standard. be able to.

  The fuel cell system of the present invention includes a hydrogen generator that reforms a raw material gas to generate fuel gas, and the fuel gas generated by the hydrogen generator is supplied to the fuel cell. is there.

  As a result, the fuel gas supplied to the fuel cell can be generated from the raw material gas, and the fuel cell system can be stably operated even in an installation place where there is no fuel gas supply path.

  In the fuel cell system of the present invention, the hydrogen generator is heated by the combustor.

  Thereby, the reforming reaction of the raw material gas in the hydrogen generator can be efficiently advanced, and the fuel gas can be generated more stably.

  In the fuel cell system of the present invention, a fuel exhaust gas condenser for recovering the second condensed water from the fuel exhaust gas is disposed in a fuel exhaust gas flow path for supplying the fuel exhaust gas from the fuel cell to the combustor, A second condensate flow path connecting the exhaust gas condenser and the coupling portion of the first condensate water flow path; and the base type anion exchanger between the coupling portion and the recovered water tank. The anions in the first and second condensed water are exchanged for hydroxide ions.

  Accordingly, in addition to the first condensed water recovered from the combustion exhaust gas discharged from the hydrogen generator, anions contained in the second condensed water recovered from the fuel exhaust gas are also hydroxylated by the basic anion exchanger. Since the concentration of hydroxide ions that are exchanged for product ions and chemically react with the hydrogen ions in the recovered water stored in the recovered water tank increases, the concentration of hydrogen ions contained in the recovered water decreases further. The pH of the drained wastewater can be more stably maintained at the drainage standard.

  In the fuel cell system of the present invention, the first condensate flow path is branched between the coupling portion and the base type anion exchanger, and the condensate in one of the condensate flow paths is a base type anion exchanger. The condensed water in the other condensed water flow path is sent to the recovered water tank without going through the basic anion exchanger.

  As a result, the anion contained in the condensed water sent to the recovered water tank via the base type anion exchanger is exchanged for hydroxide ions and then recovered to the recovered water tank. The anion in the condensed water that is sent to the recovered water tank without going through is not exchanged for hydroxide ions, but is collected as it is in the recovered water tank, so that the branch is adjusted and collected through the basic anion exchanger By adjusting the ratio between the flow rate of the condensed water sent to the water tank and the flow rate of the condensed water sent to the recovered water tank without going through the basic anion exchanger, hydroxylation that chemically reacts with hydrogen ions in the recovered water Since the concentration of the object ions can be appropriately controlled, the pH of the wastewater drained from the fuel cell system can be more reliably maintained at the drainage standard.

  In the fuel cell system of the present invention, the water tank for storing the second condensed water and the control valve are arranged between the fuel exhaust gas condenser and the coupling portion, and the second condensed water in the water tank is In this configuration, the water is intermittently sent to the recovered water tank.

  As a result, even when hydrogen in the fuel exhaust gas discharged from the fuel cell is mixed into the second condensed water, the water tank seals the hydrogen in the fuel exhaust gas with the condensed water stored therein. In addition, since the flow of hydrogen in the fuel exhaust gas is blocked by the control valve and hydrogen in the fuel exhaust gas can be prevented from leaking into the second condensed water flow path, the fuel cell system can be operated safely. Can do. Also, the anion contained in the second condensed water sent to the recovered water tank is exchanged for hydroxide ions via the basic anion exchanger, and the exchanged hydroxide ions and hydrogen ions in the recovered water are exchanged. The chemical reaction reduces the concentration of hydrogen ions contained in the recovered water, so that the pH of the wastewater discharged from the fuel cell system can be more stably maintained at the wastewater standard.

  In the fuel cell system of the present invention, the base type anion exchanger is composed of a strong base type ion exchange membrane or a strong base type ion exchange resin.

  As a result, the anions contained in the first condensed water and the second condensed water are more reliably exchanged for hydroxide ions by the strong base ion exchange membrane or the strong base ion exchange resin. The hydrogen ion concentration contained in can be more reliably reduced.

  The fuel cell system of the present invention can reduce the hydrogen ion concentration contained in the recovered water stored in the recovered water tank with a simple configuration, and can realize a low-volume fuel cell system that stably and reliably maintains the drainage standard.

1 is a configuration diagram showing a fuel cell system according to Embodiment 1 of the present invention. The block diagram which shows the fuel cell system in Embodiment 2 of this invention The block diagram which shows the fuel cell system in Embodiment 3 of this invention The block diagram which shows the fuel cell system in Embodiment 4 of this invention The block diagram which shows the fuel cell system in Embodiment 5 of this invention. The block diagram which shows the water tank in Embodiment 5 of this invention Configuration diagram showing a conventional fuel cell system

  According to a first aspect of the present invention, there is provided a fuel cell that generates power by reacting a fuel gas and an oxidant gas, a combustor that combusts at least one of a raw material gas, a fuel gas, and a fuel exhaust gas discharged from the fuel cell. A combustion exhaust gas condenser for recovering the first condensed water from the combustion exhaust gas discharged from the combustor, a recovery water tank for storing the first condensed water, and recovery water stored in the recovery water tank. An ion removing device that ionizes and purifies, and a base type anion exchanger disposed in a first condensed water flow path that connects the hydrogen generating device and the recovered water tank, and the first condensed water is In the basic anion exchanger, the anion in the first condensed water is exchanged with hydroxide ions and sent to the recovered water tank.

  By this structure, the anion contained in the 1st condensed water collect | recovered from the combustion exhaust gas discharged | emitted from a combustor is replaced | exchanged for a hydroxide ion by a base type anion exchanger, and the exchanged hydroxide is carried out. The concentration of hydrogen ions contained in the recovered water is lowered by a chemical reaction between the ions and hydrogen ions in the recovered water stored in the recovered water tank, so that a fuel cell system that satisfies the drainage standard can be realized.

  The second invention is a fuel cell system comprising a hydrogen generator for supplying fuel gas generated by reforming a raw material gas to the fuel cell, particularly in the fuel cell system of the first invention.

  With this configuration, the fuel gas to be supplied to the fuel cell can be generated from the raw material gas, and the fuel cell system can be stably operated even in an installation place where there is no fuel gas supply path.

  The third invention is a fuel cell system in which the hydrogen generator of the second invention is heated by the combustor.

  With this configuration, the reforming reaction of the raw material gas in the hydrogen generator can be efficiently advanced, and the fuel gas can be generated more stably.

  According to a fourth aspect of the present invention, there is provided a fuel exhaust gas condenser that is disposed in a fuel exhaust gas passage for supplying fuel exhaust gas from a fuel cell to a combustor, and that recovers second condensed water from the fuel exhaust gas; The second condensate water flow path connecting the first condensate water flow path connecting portion is further provided. In particular, the basic anion exchanger according to the first aspect of the present invention is provided with the connecting portion and the recovered water tank. This is a fuel cell system that is disposed between the anions in the first and second condensed waters to exchange hydroxide ions.

  With this configuration, in addition to the first condensed water recovered from the combustion exhaust gas discharged from the hydrogen generator, anions contained in the second condensed water recovered from the fuel exhaust gas are also converted into water by the basic anion exchanger. Since the concentration of hydroxide ions that are exchanged for oxide ions and chemically react with the hydrogen ions in the recovered water stored in the recovered water tank increases, the concentration of hydrogen ions contained in the recovered water decreases further and is more stable. Therefore, a fuel cell system that satisfies the drainage standard can be realized.

  In the fifth invention, in particular, the first condensed water flow channel of the first to fourth inventions branches between the coupling portion and the base type anion exchanger, and the condensed water in one condensed water flow channel is a base. This is a fuel cell system configured to be sent to a recovered water tank through a type anion exchanger, and the condensed water in the other condensed water flow path is sent to the recovered water tank without going through a base type anion exchanger.

  With this configuration, the anion contained in the condensed water sent to the recovery water tank via the base type anion exchanger is exchanged for hydroxide ions, and then recovered in the recovery water tank. The anion in the condensed water sent to the recovered water tank without going through the vessel is not exchanged for hydroxide ions, but is collected as it is in the recovered water tank. Therefore, the branch is adjusted and recovered through the basic anion exchanger. By adjusting the ratio between the flow rate of the condensed water sent to the water tank and the flow rate of the condensed water sent to the recovered water tank without going through the basic anion exchanger, hydroxylation that chemically reacts with hydrogen ions in the recovered water It is possible to appropriately control the concentration of the object ions and to realize a fuel cell system that satisfies the drainage standard more reliably.

  The sixth aspect of the invention is particularly configured to further include a water tank and a control valve that are disposed between the fuel exhaust gas condenser of the fourth and fifth aspects of the invention and the coupling portion, and store the second condensed water, The second condensed water in the water tank is a fuel cell system configured to be intermittently sent to the recovered water tank.

  With this configuration, even when hydrogen in the fuel exhaust gas discharged from the fuel cell is mixed in the second condensed water, the water tank uses the condensed water stored therein to water the hydrogen in the fuel exhaust gas. And the control valve can block the hydrogen flow in the fuel exhaust gas to prevent the hydrogen in the fuel exhaust gas from leaking into the second condensate flow path, so that the fuel cell system can be operated safely. it can. Also, the anion contained in the second condensed water sent to the recovered water tank is exchanged for hydroxide ions via the basic anion exchanger, and the exchanged hydroxide ions and hydrogen ions in the recovered water are exchanged. Since the concentration of hydrogen ions contained in the recovered water decreases due to the chemical reaction, it is possible to realize a fuel cell power generation system that satisfies the drainage standard and can maintain a stable operation.

  The seventh invention is particularly a fuel cell system in which the base type anion exchanger of the first to sixth inventions is a strong base type ion exchange membrane or a strong base type ion exchange resin.

  With this configuration, the anions contained in the first condensed water and the second condensed water are more reliably exchanged for hydroxide ions by the strong base ion exchange membrane or the strong base ion exchange resin. The concentration of hydrogen ions contained in water can be more reliably reduced, and a fuel cell system that satisfies the drainage standard can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a configuration of a fuel cell system according to a first embodiment of the present invention.

  In FIG. 1, the fuel cell system 10 includes a recovered water tank 16 that stores recovered water, an ion removing device 18 that deionizes the recovered water supplied from the recovered water tank 16 into purified water, and a recovered water tank 16. A first water pump 17 that supplies the recovered water to the ion removing device 18, a purified water tank 19 that stores the purified water supplied from the ion removing device 18, and a second water that sends purified water from the purified water tank 19. A pump 111 and an air supply device 13 for supplying air to the fuel cell 12 are provided.

  Further, the fuel cell system 10 includes a fuel cell 12 that generates power using air and fuel gas supplied from the air supply device 13, a combustion unit 14 that combusts fuel exhaust gas discharged from the fuel cell 12, and a combustion unit 14. And a combustion exhaust gas condenser 15 for condensing water vapor contained in the combustion exhaust gas obtained by burning the fuel exhaust gas discharged from the fuel cell 12 to obtain combustion exhaust gas condensed water.

  Further, the fuel cell system 10 is disposed in the first condensed water flow path 112 that guides the flue gas condensed water condensed in the flue gas condenser 15 to the recovered water tank 16 and the first condensed water flow path 112, and condenses the flue gas. A base type anion exchanger 11 for exchanging anions contained in water with hydroxide ions; a fuel exhaust gas condenser 115 for condensing water vapor contained in fuel exhaust gas discharged from the fuel cell 12 to obtain fuel exhaust gas condensed water; It has.

  Further, the fuel cell system 10 condenses and removes the fuel exhaust gas condensed water flow path 116 that guides the fuel exhaust gas condensed water condensed by the fuel exhaust gas condenser 115 to the recovered water tank, and the fuel exhaust gas condenser 115 condenses the water vapor contained in the fuel exhaust gas. The fuel exhaust gas flow path 117 through which the fuel exhaust gas flows and the exhaust air condenser 114 that condenses water vapor contained in the exhaust air exhausted from the fuel cell 12 to obtain exhaust air condensed water are provided.

  Furthermore, the fuel cell system 10 includes an exhaust air condensed water flow path 113 that guides the exhaust air condensed water condensed by the exhaust air condenser 114 to the recovered water tank 16. Further, the recovered water tank 16 has a drain port 110 for draining excess recovered water stored in the recovered water tank 16.

  Below, the material of the component which comprises the fuel cell system 10, and its effect | action are demonstrated concretely.

  The recovered water tank 16 is made of, for example, stainless steel or resin, and the recovered water is stored therein. The ion removing device 18 is filled with, for example, an ion exchange resin that adsorbs anions and cations in the recovered water and deionizes the recovered water to generate purified water in a container made of, for example, stainless steel or resin. . The base type anion exchanger 11 is configured by, for example, filling a container made of stainless steel, resin, or the like with a strong base type anion exchange membrane, a strong base type ion exchange resin, or a mixture thereof. Exchange anions for hydroxide ions.

  In addition, the fuel cell 12 has catalyst platinum particles on carbon black on both sides of a polymer-based hydrogen ion conductive electrolyte membrane (not shown) in which a sulfone side chain is attached to the main chain of fluorocarbon. It is comprised from the aggregate | assembly which laminated | stacked the battery provided with the fuel electrode and air electrode (not shown) which carried and comprised. Then, power is generated by an electrochemical reaction between hydrogen in the fuel gas supplied to the fuel electrode and oxygen in the air supplied from the air supply device 13 to the air electrode.

  Next, the operation of the fuel cell system 10 of the present embodiment will be described.

  The fuel cell 12 generates power by an electrochemical reaction between a fuel gas supplied from a gas supply pipe (not shown) and oxygen in the air supplied from the air supply device 13. The fuel exhaust gas discharged without being used in the fuel cell 12 passes through the fuel exhaust gas condenser 115, passes through the fuel exhaust gas flow channel 117, and is supplied to the combustion unit 14 to cause combustion of the fuel exhaust gas. At this time, the fuel exhaust gas from the fuel cell 12 supplied to the combustion unit 14 is removed from the water vapor contained in the fuel exhaust gas by the fuel exhaust gas condenser 115 disposed in the middle of the flow path. Supplied. By removing the water vapor, the fuel exhaust gas having a small water content is combusted in the combustion unit 14, and stable combustion without generating soot is realized.

  Next, the flow of condensed water, recovered water, and purified water in the fuel cell system 10 of the present embodiment will be described.

  First, the flow of condensed water will be described. As shown in FIG. 1, a fuel exhaust gas condenser 115 disposed in a fuel exhaust gas flow path from the fuel cell 12 condenses water vapor contained in the fuel exhaust gas discharged from the fuel cell 12 to obtain fuel exhaust gas condensed water. . The obtained fuel exhaust gas condensate passes through the fuel exhaust gas condensate flow channel 116 and is stored in the water storage part of the recovered water tank 16. Further, the flue gas contained in the flue gas obtained by burning the flue gas flowing through the flue gas flow passage 117 is condensed by the flue gas condenser 15 disposed in the flue gas flow passage from the combustion section 14 to form the flue gas. Condensed water is obtained. The obtained flue gas condensate is sent to the first condensate flow path 112 as recovered water, passes through the basic anion exchanger 11, and is stored in the water storage part of the recovered water tank 16.

  Further, the exhaust air condenser 114 disposed in the exhaust air flow path from the fuel cell 12 condenses water vapor contained in the exhaust air exhausted from the fuel cell 12 to obtain exhaust air condensed water. The obtained exhausted air condensed water is sent as recovered water to the recovered water tank 16 via the exhausted air condensed water channel 113 and stored in the water storage part of the recovered water tank 16.

  The excess recovered water in the recovered water tank 16 is drained from the drain port 110 disposed in the recovered water tank 16.

  Next, the flow of recovered water and purified water will be described. The recovered water stored in the recovered water tank 16 is sent to the ion removing device 18 by the first water pump 17, deionized, and then stored in the purified water tank 19 as purified water. The purified water stored in the purified water tank 19 is circulated through the fuel cell 12 by the second water pump 111 to maintain the fuel cell 12 at a constant temperature.

  As described above, in the present embodiment, the condensed water recovered from the steam contained in the combustion exhaust gas and the fuel gas is passed through the basic anion exchanger disposed in the flow path for recovering the condensed water, and the recovered water is recovered. By storing in the water storage part of the tank, the anions contained in the condensed water are exchanged for hydroxide ions, and the exchanged hydroxide ions are chemically reacted with hydrogen ions in the recovered water stored in the recovered water tank. Thus, the concentration of hydrogen ions contained in the recovered water can be reduced, and the pH of the drainage discharged from the fuel cell system can be maintained at the drainage standard.

  Hereinafter, specific effects of the fuel cell system 10 in the present embodiment will be described.

  First, when the fuel cell system 10 having the configuration of the present embodiment was continuously operated in the power generation state of 1 kW, the pH of drainage discharged from the drain of the recovery water tank was evaluated. .5 was maintained.

On the other hand, for comparison, a fuel cell system without a base type anion exchanger was evaluated in the same manner. As a result, the pH of wastewater was 5.0, which did not satisfy the wastewater standard.
From the above, it has been found that in the fuel cell system of the present embodiment, the pH of the drainage discharged from the recovered water tank stably satisfies the drainage standard.

(Embodiment 2)
FIG. 2 shows the configuration of the fuel cell system according to the second embodiment of the present invention.

  In FIG. 2, the fuel cell system 20 includes a recovered water tank 28 that stores recovered water, an ion removing device 210 that deionizes the recovered water supplied from the recovered water tank 28 into purified water, and a recovered water tank 28. A first water pump 29 that supplies the recovered water to the ion removing device 210, a purified water tank 211 that stores the purified water supplied from the ion removing device 210, and a second water that sends purified water from the purified water tank 211 A pump 214 and a third water pump 213.

  Further, the fuel cell system 20 includes a hydrogen generator 24 that receives a supply of deionized water from the second water pump 214 and reforms a city gas that is a raw material gas to generate a fuel gas mainly containing hydrogen; An air supply device 23 that supplies air to the fuel cell 22, a fuel cell 22 that generates power using the fuel gas supplied from the hydrogen generation device 24 and the air supplied from the air supply device 23, and the hydrogen generation device 24 A fuel gas condenser 26 that condenses and removes water vapor contained in the fuel gas, and a bypass channel 216 that guides the fuel gas supplied from the hydrogen generator 24 to the fuel gas condenser 26 are provided.

  Further, the fuel cell system 20 includes a three-way valve 219 that switches the flow direction of the fuel gas sent from the hydrogen generator 24 to a bypass gas flow path 216 and a fuel gas supply path to the fuel cell 22, and the hydrogen generator 24. Disposed in the combustion section 25 for burning the raw material gas, the fuel gas flowing through the bypass passage 216 and the fuel gas condenser 26, and the fuel exhaust gas discharged from the fuel cell 22, and the raw material gas in the hydrogen generator 24 And the fuel gas flowing through the bypass channel 216 and the fuel gas condenser 26 and the combustion exhaust gas obtained by burning the fuel exhaust gas discharged from the fuel cell 22 is condensed to obtain combustion exhaust gas condensed water And an exhaust gas condenser 27.

  Further, the fuel cell system 20 is disposed in the first condensed water flow path 215 that guides the flue gas condensed water condensed in the flue gas condenser 27 to the recovered water tank 28 and the first condensed water flow path 215, and condenses the combustion exhaust gas. A base type anion exchanger 21 for exchanging anions contained in water with hydroxide ions, a fuel exhaust gas condenser 220 for condensing water vapor contained in fuel exhaust gas discharged from the fuel cell 22 to obtain fuel exhaust gas condensed water, A fuel exhaust gas condensed water flow path 221 that guides the fuel exhaust gas condensed water condensed by the fuel exhaust gas condenser 220 to a recovered water tank.

  Further, the fuel cell system 20 includes a fuel exhaust gas passage 222 through which the fuel exhaust gas from which the water vapor contained in the fuel exhaust gas is condensed and removed by the fuel exhaust gas condenser 220 flows, and exhaust gas discharged from the fuel cell 22. An exhaust air condenser 218 that condenses the water vapor contained therein to obtain exhaust air condensate, and an exhaust air condensate flow path 217 that guides the exhaust air condensate condensed in the exhaust air condenser 218 to the recovered water tank 28. . The recovered water tank 28 has a drain outlet 212 for draining excess recovered water stored in the recovered water tank 28.

  Below, the material of the component which comprises the fuel cell system 20, and its effect | action are demonstrated concretely.

The recovered water tank 28 is made of, for example, stainless steel or resin, and the recovered water is stored therein. The ion removing device 210 is, for example, in a container made of stainless steel or resin,
An ion exchange resin that adsorbs anions and cations in the recovered water and deionizes the recovered water to generate purified water is packed. The base type anion exchanger 21 is configured by, for example, filling a strong base type anion exchange membrane, a strong base type ion exchange resin, or a mixture thereof in a container made of stainless steel, a resin, or the like. Exchange anions for hydroxide ions.

  In the hydrogen generator 24, for example, a container made of stainless steel or the like is filled with a catalyst in which ruthenium is supported on an alumina carrier. Then, the city gas and the deionized purified water supplied via the ion removing device 210 are chemically reacted at about 650 ° C. to generate hydrogen and carbon dioxide. At this time, the purified water supplied from the ion removing device 210 plays a role of causing the chemical reaction to proceed. The hydrogen generator 24 is further provided with a catalyst supporting platinum on an alumina carrier on the downstream side to oxidize a small amount of carbon monoxide generated by a chemical reaction into carbon dioxide, for example, a selective oxidation means. Have.

  In addition, the fuel cell 22 has catalyst platinum particles on carbon black on both sides of a polymer-based hydrogen ion conductive electrolyte membrane (not shown) in which a sulfone side chain is attached to the main chain of fluorocarbon. It is comprised from the aggregate | assembly which laminated | stacked the battery provided with the fuel electrode and air electrode (not shown) which carried and comprised. Then, power is generated by an electrochemical reaction between hydrogen in the fuel gas supplied from the hydrogen generator 24 to the fuel electrode and oxygen in the air supplied from the air supply device 13 to the air electrode.

  The hydrogen generator 24 is provided with a combustion unit 25. The combustion unit 25 burns city gas, which is a raw material gas, at the start of operation of the fuel cell system 20, and burns hydrogen in fuel exhaust gas discharged without being used by the fuel cell 22 in stable operation.

  Next, the operation of the fuel cell system 20 of the present embodiment will be described.

  First, at the start of operation, city gas as raw material gas from a gas supply pipe (not shown) and air from a blower (not shown) are supplied to the combustion section 25 and combustion starts to obtain fuel gas. . The fuel gas is sent to the fuel gas condenser 26 through the three-way valve 219 and the bypass channel 216. The fuel gas sent to the fuel gas condenser 26 is sent to the combustion unit 25 after the water vapor contained therein is condensed and removed in the fuel gas condenser 26. Then, in the hydrogen generator 24, the combustion exhaust gas obtained by burning the city gas as the raw material gas or the fuel gas flowing through the bypass flow path 216 is sent to the combustion exhaust gas condenser 27, and is contained in the combustion exhaust gas. The contained water vapor is condensed, and is recovered as a combustion exhaust gas condensed water in the recovered water tank 28 after passing through the first condensed water flow path 215 and the basic anion exchanger 21.

  At the same time, the combustion unit 25 heats the catalyst filled in the hydrogen generator 24 to about 650 ° C. When the catalyst of the hydrogen generator 24 is heated to about 650 ° C., the hydrogen generator 24 performs the following second stage operation.

  First, the hydrogen generator 24 uses, for example, a reforming reaction between purified water supplied from the purified water tank 211 by the second water pump 214 and city gas supplied from a gas supply pipe (not shown). The fuel gas mainly containing hydrogen is generated, and the generated fuel gas is supplied to the fuel cell 22 through the three-way valve 219.

The fuel cell 22 generates power by an electrochemical reaction between hydrogen in the fuel gas supplied from the hydrogen generator 24 and oxygen in the air supplied from the air supplier 23. The fuel exhaust gas discharged without being used in the fuel cell 22 passes through the fuel exhaust gas condenser 220, passes through the fuel exhaust gas flow path 222, and is supplied to the combustion unit 25 of the hydrogen generator 24 to burn the fuel exhaust gas. Happens. At this time, water vapor contained in the fuel exhaust gas is removed from the fuel exhaust gas from the fuel cell 22 supplied to the combustion unit 25 of the hydrogen generator 24 by the fuel exhaust gas condenser 220 disposed in the middle of the flow path. , Supplied to the combustion unit 25. By removing the water vapor, the fuel exhaust gas having a small water content is burned in the combustion section 25, and stable combustion without generating soot is realized.

  Next, the flow of condensed water, recovered water, and purified water in the fuel cell system 20 of the present embodiment will be described.

First, the flow of condensed water will be described. As shown in FIG. 2, the fuel exhaust gas condenser 220 disposed in the fuel exhaust gas flow path from the fuel cell 22 condenses water vapor contained in the fuel exhaust gas discharged from the fuel cell 22 to obtain fuel exhaust gas condensed water. . The obtained fuel exhaust gas condensate passes through the fuel exhaust gas condensate flow path 221 and is stored in the water storage part of the recovered water tank 28. Further, the combustion exhaust gas condenser 27 disposed in the combustion exhaust gas flow path from the hydrogen generation device 24 causes the raw gas to pass through the hydrogen generation device 24, the fuel gas flowing through the bypass flow path 216, and the fuel exhaust gas flow path 222. Condensed water of combustion exhaust gas is obtained by condensing water vapor contained in the combustion exhaust gas obtained by burning the flowing fuel exhaust gas. The obtained flue gas condensate is sent to the first condensate flow path 215 as recovered water, passes through the base type anion exchanger 21, and is stored in the water storage part of the recovered water tank 28.
Further, the exhaust air condenser 218 disposed in the exhaust air flow path from the fuel cell 22 condenses the water vapor contained in the exhaust air exhausted from the fuel cell 22 to obtain exhaust air condensed water. The obtained exhausted air condensed water is sent as recovered water to the recovered water tank 28 via the exhausted air condensed water flow path 217 and stored in the water storage part of the recovered water tank 28.

The excess recovered water in the recovered water tank 28 is drained from a drain outlet 212 disposed in the recovered water tank 28.
Next, the flow of recovered water and purified water will be described. The recovered water stored in the recovered water tank 28 is sent to the ion removing device 210 by the first water pump 29, deionized, and then stored in the purified water tank 211 as purified water. The purified water stored in the purified water tank 211 is supplied to the hydrogen generator 24 by the second water pump 214 and used for reforming the city gas as the raw material gas, and by the third water pump 213, The fuel cell 22 is circulated to maintain the fuel cell 22 at a constant temperature.
As described above, in the present embodiment, the condensed water recovered from the steam contained in the combustion exhaust gas and the fuel gas is passed through the basic anion exchanger disposed in the flow path for recovering the condensed water, and the recovered water is recovered. By storing in the water storage part of the tank, the anions contained in the condensed water are exchanged for hydroxide ions, and the exchanged hydroxide ions are chemically reacted with hydrogen ions in the recovered water stored in the recovered water tank. Thus, the concentration of hydrogen ions contained in the recovered water can be reduced, and the pH of the drainage discharged from the fuel cell system can be maintained at the drainage standard.

  Hereinafter, specific effects of the fuel cell system 20 in the present embodiment will be described.

  First, when the fuel cell system 20 having the configuration of the present embodiment was continuously operated in a power generation state of 1 kW, the pH of drainage discharged from the drain of the recovered water tank was evaluated. .5 was maintained.

On the other hand, for comparison, a fuel cell system without a base type anion exchanger was evaluated in the same manner. As a result, the pH of wastewater was 5.0, which did not satisfy the wastewater standard.
From the above, it has been found that in the fuel cell system of the present embodiment, the pH of the drainage discharged from the recovered water tank stably satisfies the drainage standard.

(Embodiment 3)
FIG. 3 shows a configuration of a fuel cell system according to the third embodiment of the present invention. In FIG. 3, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof may be omitted.

  In FIG. 3, the fuel cell system 30 includes a coupling portion 31 in the first condensate flow path 215, and connects the fuel exhaust gas condenser 220 and the coupling portion 31 instead of the fuel exhaust gas condensate flow path 221 in FIG. 2. It differs from the fuel cell system of Embodiment 2 by the point which set it as the structure which has the 2nd condensed water flow path 32. FIG. Since other components and their operations are the same as those in the second embodiment, description thereof is omitted.

  Hereinafter, the flow of condensed water, recovered water, and purified water, which is the point of the invention of the fuel cell system 30 of the present embodiment, will be described.

  First, the flow of condensed water will be described. As shown in FIG. 3, the fuel exhaust gas condenser 220 disposed in the fuel exhaust gas flow path from the fuel cell 22 condenses water vapor contained in the fuel exhaust gas discharged from the fuel cell 22 to obtain fuel exhaust gas condensed water. . Then, the obtained fuel exhaust gas condensate is sent to the coupling portion 31 via the second condensate flow path 32, passed through the first condensate flow path 215, and passed through the basic anion exchanger 21. The water is stored in the water storage part of the recovered water tank 28. Further, the combustion exhaust gas condenser 27 disposed in the combustion exhaust gas flow path from the hydrogen generation device 24 causes the raw gas to pass through the hydrogen generation device 24, the fuel gas flowing through the bypass flow path 216, and the fuel exhaust gas flow path 222. Condensed water of combustion exhaust gas is obtained by condensing water vapor contained in the combustion exhaust gas obtained by burning the flowing fuel exhaust gas. The obtained flue gas condensate is sent to the first condensate flow path 215 as recovered water, passes through the base type anion exchanger 21, and is stored in the water storage part of the recovered water tank 28.

  Further, the exhaust air condenser 218 disposed in the exhaust air flow path from the fuel cell 22 condenses the water vapor contained in the exhaust air exhausted from the fuel cell 22 to obtain exhaust air condensed water. The obtained exhausted air condensed water is sent as recovered water to the recovered water tank 28 via the exhausted air condensed water flow path 217 and stored in the water storage part of the recovered water tank 28.

The excess recovered water in the recovered water tank 28 is drained from a drain outlet 212 disposed in the recovered water tank 28.
Next, the flow of recovered water and purified water will be described. The recovered water stored in the recovered water tank 28 is sent to the ion removing device 210 by the first water pump 29, deionized, and then stored in the purified water tank 211 as purified water. The purified water stored in the purified water tank 211 is supplied to the hydrogen generator 24 by the second water pump 214 and used for reforming the raw material gas, and the fuel cell 22 is supplied by the third water pump 213. It circulates and maintains the fuel cell 22 at a constant temperature.

  As described above, in the present embodiment, the condensed water recovered from the combustion exhaust gas and the water vapor contained in the fuel gas and the fuel exhaust gas is passed through the basic anion exchanger disposed in the first condensed water flow path, By storing it in the water storage section of the recovered water tank, the anions contained in the condensed water are exchanged for hydroxide ions, and the exchanged hydroxide ions and the hydrogen ions in the recovered water are chemically reacted, so that The concentration of hydrogen ions contained can be reduced, and the pH of the wastewater drained from the fuel cell system can be more stably maintained at the drainage standard.

  Hereinafter, specific effects of the fuel cell system 30 in the present embodiment will be described.

First, when the fuel cell system 30 having the configuration of the present embodiment was continuously operated in the power generation state of 1 kW, the pH of drainage discharged from the drain of the recovered water tank was evaluated. 0.0 was maintained.

On the other hand, for comparison, a fuel cell system without a base type anion exchanger was evaluated in the same manner. As a result, the pH of wastewater was 5.0, which did not satisfy the wastewater standard.
From the above, it has been found that in the fuel cell system of the present embodiment, the pH of the drainage discharged from the recovered water tank stably satisfies the drainage standard.

(Embodiment 4)
FIG. 4 is a configuration diagram showing a fuel cell system according to Embodiment 4 of the present invention. 4, the same components as those in FIG. 3 are denoted by the same reference numerals, and description thereof may be omitted.

  In FIG. 4, the fuel cell system 40 includes a branch 42 disposed between the coupling portion 31 and the base type anion exchanger 21 in the first condensed water flow path 215, and the branch 42 and the recovered water tank 28. The third condensate water flow path 41 is provided, and a part of the fuel exhaust gas condensate and the combustion exhaust gas condensate is collected in the recovered water tank 28 without going through the basic anion exchanger 21. This is different from the fuel cell system of Embodiment 3. Since other components and their operations are the same as those in the third embodiment, description thereof is omitted.

  Hereinafter, the flow of condensed water, recovered water, and purified water, which is the point of the invention of the fuel cell system 40 of the present embodiment, will be described.

First, the flow of condensed water will be described. As shown in FIG. 4, a part of the fuel exhaust gas condensate and the combustion exhaust gas condensate passes through the base type anion exchanger 21 and is then stored in the water storage part of the recovered water tank 28. On the other hand, the fuel exhaust gas condensate and the other part of the condensate of the combustion exhaust gas flow from the branch 42 through the third condensate flow path 41 and are directly recovered without passing through the basic anion exchanger 21. It is stored in the water storage part of the water tank 28.
At this time, the excess recovered water in the recovered water tank 28 is drained from the drain port 212 arranged in the recovered water tank 28.
Next, the flow of recovered water and purified water will be described. The recovered water stored in the recovered water tank 28 is sent to the ion removing device 210 by the first water pump 29, deionized, and then stored in the purified water tank 211 as purified water. The purified water stored in the purified water tank 211 is supplied to the hydrogen generator 24 by the second water pump 214 and used for reforming the raw material gas, and is circulated through the fuel cell 22 by the third water pump 213. The fuel cell 22 is maintained at a constant temperature.
As described above, in the present embodiment, a part of the condensed water recovered from the combustion exhaust gas, the fuel gas, and the water vapor contained in the fuel exhaust gas passes through the basic anion exchanger disposed in the first condensed water channel. Then, by storing it in the water storage part of the recovered water tank, the anions contained in the condensed water are exchanged for hydroxide ions, and some of the condensed water recovered from the water vapor contained in the combustion exhaust gas and fuel exhaust gas is Since the anion contained in the condensed water is not exchanged for hydroxide ions by storing in the water storage part of the recovered water tank without passing through the basic anion exchanger, the branch is adjusted and passed through the basic anion exchanger. The concentration of hydroxide ions that chemically react with hydrogen ions in the recovered water is adjusted by adjusting the flow rate of the condensed water that flows through and the flow rate of the condensed water that does not pass through the basic anion exchanger. It is possible, the PH of wastewater discharged from the fuel cell system can be maintained to ensure the effluent standards.
The flow rate of each condensed water flowing through the first condensed water channel and the third condensed water channel in the branch is changed by changing the diameters of the first condensed water channel and the third condensed water channel. It is possible to control by changing the flow resistance between the first condensed water flow path and the third condensed water flow path by providing means such as providing a restriction on the condensed water flow path.
Hereinafter, specific effects of the fuel cell system 40 in the present embodiment will be described.

  First, when the fuel cell system 40 having the configuration of the present embodiment was continuously operated in a power generation state of 1 kW, the pH of drainage discharged from the drain of the recovered water tank was evaluated. .2 was maintained. At this time, the diameter of the first condensed water flow path and the diameter of the third condensed water flow path are adjusted, and the flow rate of the condensed water flowing through the first condensed water flow path and the third condensed water flow path are passed through. The flow rate ratio of the condensed water flow rate was adjusted to 2: 8.

  On the other hand, for comparison, a fuel cell system without a base type anion exchanger was evaluated in the same manner. As a result, the pH of wastewater was 5.0, which did not satisfy the wastewater standard.

  From the above, it was found that the pH of the drainage discharged from the recovered water tank of the fuel cell system of the present embodiment stably satisfies the drainage standard.

(Embodiment 5)
FIG. 5 is a configuration diagram showing a fuel cell system according to Embodiment 5 of the present invention. In FIG. 5, the same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof may be omitted.

  In FIG. 5, the fuel cell system 50 includes a water tank 51 that stores fuel exhaust gas condensed water obtained by condensing water vapor in the fuel exhaust gas by the fuel exhaust gas condenser 220 in the second condensed water flow path 32, The fuel cell system of the fourth embodiment is different from the fuel cell system of the fourth embodiment in that a control valve 52 for controlling the flow state of the condensed water stored in the tank 51 is disposed. Since other components and their operations are the same as those in the fourth embodiment, description thereof is omitted.

  Hereinafter, the flow of condensed water, recovered water, and purified water, which is the point of the invention of the fuel cell system 50 of the present embodiment, will be described.

  First, the flow of condensed water will be described with reference to FIG. Fuel exhaust gas condensed water obtained by condensing water vapor contained in the fuel exhaust gas discharged from the fuel cell 22 by the fuel exhaust gas condenser 220 is sent to the water tank 51. In the water tank 51, the fuel exhaust gas condensate is condensed by the fuel exhaust gas stored in the water tank 51, as shown in FIG. Water is stored in the water tank 51 until the water level reaches the first predetermined water level. At this time, even if hydrogen in the fuel exhaust gas is mixed into the second condensed water, the condensed water stored in the water tank 51 and the control valve 52 block the flow of hydrogen in the fuel exhaust gas, and the fuel exhaust gas. The hydrogen inside is prevented from leaking into the second condensed water channel 32. On the other hand, as shown in FIG. 6B, when the water level of the fuel exhaust gas condensate stored in the water tank 51 reaches the first predetermined water level, the control valve 52 is opened and the water tank 51 stores the water. The fuel exhaust gas condensed water passes through the second condensed water channel 32 and is sent to the coupling portion 31 of the first condensed water channel 215. At this time, even if hydrogen in the fuel exhaust gas is mixed into the second condensed water, the condensed water stored in the water tank 51 seals the hydrogen in the fuel exhaust gas, and the hydrogen in the fuel exhaust gas is the first. It is prevented from leaking into the second condensed water channel 32. Next, as shown in FIG. 6 (c), when the water level of the fuel exhaust gas condensate stored in the water tank 51 is lowered to the second predetermined water level, the control valve 52 is closed and the fuel exhaust gas condensate is 51 is stored. At this time, even if hydrogen in the fuel exhaust gas is mixed into the second condensed water, the condensed water stored in the water tank 51 and the control valve 52 block the flow of hydrogen in the fuel exhaust gas, and the fuel exhaust gas. The hydrogen inside is prevented from leaking into the second condensed water channel 32. Here, as shown in FIG. 6, the first predetermined water level and the second predetermined water level are detected by a water level detection means 61 such as a water level sensor, and operate by receiving information from the water level detection means 61. The open / close state of the control valve 52 is switched by the control device 62.

In this manner, the fuel exhaust gas condensed water that has flowed from the water tank 51 through the control valve 52 to the second condensed water flow path 32 flows through the coupling portion 31 to the first condensed water flow path 215. A part of the fuel exhaust gas condensate and the combustion exhaust gas condensate pass through the basic anion exchanger 21 and are then stored in the water storage part of the recovered water tank 28. On the other hand, the fuel exhaust gas condensate and the other part of the condensate of the combustion exhaust gas flow from the branch 42 through the third condensate flow path 41 and are directly recovered without passing through the basic anion exchanger 21. It is stored in the water storage part of the water tank 28.

  At this time, the excess recovered water in the recovered water tank 28 is drained from the drain port 212 arranged in the recovered water tank 28.

  Next, the flow of recovered water and purified water will be described. The recovered water stored in the recovered water tank 28 is sent to the ion removing device 210 by the first water pump 29, deionized, and then stored in the purified water tank 211 as purified water. The purified water stored in the purified water tank 211 is supplied to the hydrogen generator 24 by the second water pump 214 and used for reforming the raw material gas, and is circulated through the fuel cell 22 by the third water pump 213. The fuel cell 22 is maintained at a constant temperature.

  As described above, in the present embodiment, the fuel exhaust gas condensed water recovered from the fuel exhaust gas discharged from the fuel cell is stored in the water tank, so that the fuel exhaust gas condensed water is discharged from the fuel cell. Even when this hydrogen is mixed, hydrogen in the fuel exhaust gas can be prevented from flowing into the second condensed water channel or the first condensed water channel, so that the fuel cell system can be operated safely. Further, after passing a part of the condensed water recovered from the combustion exhaust gas, the fuel gas, and the water vapor contained in the fuel exhaust gas through the basic anion exchange means arranged in the first condensed water flow path, the water storage part of the recovered water tank The anion contained in the condensed water is exchanged for hydroxide ions, and some condensed water recovered from the water vapor contained in the combustion exhaust gas and the fuel exhaust gas does not pass through the basic anion exchange means. Since the anion contained in the condensed water is not exchanged for hydroxide ions by storing it in the water storage section of the recovered water tank, the flow rate of the condensed water passing through the basic anion exchanger and the basic anion exchange are adjusted. By adjusting the flow rate of the condensed water that does not pass through the vessel, the concentration of hydroxide ions that chemically react with hydrogen ions in the recovered water can be adjusted appropriately. The PH of wastewater drained from Temu can be maintained to ensure that the effluent standard.

  Hereinafter, specific effects of the fuel cell system 50 in the present embodiment will be described.

  First, when the fuel cell system 50 having the configuration of the present embodiment was continuously operated in a power generation state of 1 kW, the pH of drainage discharged from the drain of the recovered water tank was evaluated. .2 was maintained. At this time, the diameter of the first condensed water flow path and the diameter of the third condensed water flow path are adjusted, and the flow rate of the condensed water flowing through the first condensed water flow path and the third condensed water flow path are passed through. The flow rate ratio of the condensed water flow rate was adjusted to 2: 8.

  On the other hand, for comparison, a fuel cell system without a base type anion exchanger was evaluated in the same manner. As a result, the pH of wastewater was 5.0, which did not satisfy the wastewater standard.

  From the above, it has been found that in the fuel cell system of the present embodiment, the pH of the drainage discharged from the recovered water tank stably satisfies the drainage standard.

  As described above, the fuel cell system according to the present invention can stably maintain the pH of drainage at the drainage standard, so that it can be used in industrial fields such as stationary, mobile or portable fuel cell systems. Applicable.

10, 20, 30, 40, 50, 70 Fuel cell system 11, 21 Basic anion exchanger 12, 22, 72 Fuel cell 13, 23, 73 Air supply device 14, 25, 75 Combustion section 15, 27, 77 Combustion Exhaust gas condenser 16, 28, 78 Recovery water tank 17, 29 First water pump 18, 210, 714 Ion remover 19, 211 Purified water tank 24, 74 Hydrogen generator 26 Fuel gas condenser 31 Coupling part 32 Second Condensate flow path 41 Third condensate flow path 42 Branch 51 Water tank 52 Control valve 61 Water level detection means 62 Controller 71, 110, 212 Drain port 76, 115, 220 Fuel exhaust gas condenser 111, 214 Second water pump 112, 215 First condensed water flow path 113, 217 Exhaust air condensed water flow path 114, 218 Exhaust air condenser 116, 22 DESCRIPTION OF SYMBOLS 1 Fuel exhaust gas condensed water flow path 117, 222 Fuel exhaust gas flow path 213 3rd water pump 216 Bypass flow path 219 Three-way valve

Claims (7)

A fuel cell that generates electricity by reacting a fuel gas and an oxidant gas; and
A combustor that combusts at least one of a raw material gas, a fuel gas, and a fuel exhaust gas discharged from the fuel cell;
A recovered water tank in which first condensed water recovered from the combustion exhaust gas discharged from the combustor is stored;
An ion removing device for deionizing and purifying the recovered water stored in the recovered water tank;
A basic anion exchanger disposed in a first condensed water flow path connecting the combustor and the recovered water tank;
Have
The first condensed water is sent to the recovered water tank by exchanging anions in the first condensed water with hydroxide ions in the basic anion exchanger.
Fuel cell system. The fuel cell system according to claim 1, further comprising a hydrogen generator that supplies a fuel gas generated by reforming a raw material gas to the fuel cell. The fuel cell system according to claim 2, wherein the hydrogen generator is heated by the combustor. A fuel exhaust gas condenser disposed in a fuel exhaust gas flow path for supplying fuel exhaust gas from the fuel cell to the combustor and recovering second condensed water from the fuel exhaust gas;
A second condensate water channel connecting the fuel exhaust gas condenser and the coupling portion of the first condensate water channel;
The basic anion exchanger is disposed between the coupling portion and the recovered water tank, and exchanges anions in the first and second condensed water with hydroxide ions;
The fuel cell system according to claim 1. The first condensate water channel branches off between the coupling portion and the base type anion exchanger, and the condensate water in one condensate water channel is sent to the recovered water tank via the base type anion exchanger. The condensed water in the other condensed water flow path is configured to be sent to the recovered water tank without going through the basic type anion exchanger.
The fuel cell system according to claim 4. A water tank that is disposed between the fuel exhaust gas condenser and the coupling portion and stores the second condensed water, and a control valve disposed in the second condensed water flow path;
The second condensed water in the water tank is configured to be intermittently sent to the recovered water tank.
The fuel cell system according to claim 4 or 5. The fuel cell system according to claim 1, wherein the anion exchanger is a strong base type ion exchange membrane.

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