JP2010250948A - Fuel cell system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell system of simple configuration, in which proliferation of germs in condensed water and degradation of ion exchange resin are suppressed, the system being excellent in durability. <P>SOLUTION: The fuel cell system includes a condensed water tank 25 for pooling condensed water, a heater 27 for heating and thermally sterilizing condensed water, a cooling water tank 23 provided to a cooling water circulation path 8 through which a cooling water circulates, a water supply pipe 15 for the condensed water in the condensed water tank 25 to be refilled to the cooling water tank 23 as cooling water, a pump 24 for sending the condensed water in the condensed water tank 25 to the cooling water tank 23 through the water supply pipe 15, an ion exchange resin 26 which is provided in the middle of the water supply pipe 15 to process the condensed water from the condensed water tank 25, and a condensed water-cooling means 11 which is provided between the condensed water tank 25 and the ion exchange resin 26 to cool the condensed water sent to the ion exchange resin 26. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuel cell system that generates hot water by recovering and using heat generated with power generation of a fuel cell.

  In recent years, fuel cells generate electric energy by direct reaction of hydrogen and oxygen, and are expected as clean power generation devices that have high power generation efficiency and emit almost no air pollutants. In particular, a fuel cell system that recovers and uses the heat generated during power generation for hot water supply or heating has high overall energy efficiency, and is expected to spread as an energy saving device.

  Hereinafter, the configuration of a conventional fuel cell system will be described with reference to FIG.

  As shown in FIG. 3, the fuel processing device 52 generates hydrogen that becomes the fuel gas of the fuel cell 51 by reforming a raw material gas such as methane with water vapor, for example. The fuel cell 51 generates electricity by causing hydrogen generated in the fuel processing device 52 to flow through the anode 62 and oxygen in the air supplied by an air blower or the like to flow through the cathode 63 to cause electrochemical reaction. Do.

  Further, as shown in FIG. 3, a hot water storage tank 53 and a hot water storage pump 54, an exhaust gas heat exchanger 55 that recovers heat from the exhaust gas of the fuel processing device 52, and an off-gas heat exchange provided at the outlet of the cathode 63 of the fuel cell 51. The hot water storage water circulation channel 59 is configured so that the hot water stored in the hot water storage tank 53 is heated by connecting the pipe 56 and the cooling water heat exchanger 57 of the fuel cell 51 in this order. Then, the cooling water circulation pump 60 circulates the cooling water stored in the cooling water tank 73 to the cooling water circulation passage 58 connecting the cooling unit 64 inside the fuel cell 51 and the cooling water heat exchanger 57.

  At this time, the condensed water obtained by cooling the cathode offgas of the fuel cell 51 in the offgas heat exchanger 56, and the condensed water obtained by cooling the exhaust gas of the fuel processing device 2 in the exhaust gas heat exchanger 55, Is separated from the cathode off-gas and the exhaust gas in the gas-liquid separator 70. The separated condensed water is collected in the condensed water tank 75 and supplied to the cooling water tank 73 by the pump 74 and used as cooling water for the fuel cell 51. The condensed water collected in the condensed water tank 75 contains carbonic acid components and some impurities from the exhaust gas, and is therefore purified through the ion exchange resin 76 constituting the water treatment device, and is supplied to the cooling water tank 73. Supplied.

  However, the condensed water recovered in the condensed water tank 75 is substantially pure water having some impurities, and does not contain a chlorine component having a bactericidal action like city water. The condensed water tank 75 is generally open to the outside air. Therefore, the condensed water in the condensed water tank 75 is in an environment in which various germs are likely to propagate. If a large number of germs propagate in the condensed water, the pump 74 and the ion exchange resin 76 as a pure water treatment device are clogged, and the supply of cooling water is hindered. As a result, the cooling water in the cooling water tank 73 is insufficient.

  Therefore, in order to solve the above-mentioned problem, the condensed water stored in the condensed water tank 75 is periodically heated and sterilized by a heating means such as a heater 77 to suppress the propagation of microorganisms such as germs in the condensed water. Has been proposed (see, for example, Patent Document 1).

JP-A-8-138714

  However, in the above conventional configuration, the ion exchange resin 76 used for the purification of condensed water is generally easily deteriorated by heating. Therefore, the ion exchange resin 76 is deteriorated by the inflow of hot water, and sufficient pure water is cooled. There was a problem that the water tank 73 was not supplied.

  This is due to the following reason. That is, since the ion exchange resin 76 used in the fuel cell system is generally susceptible to heat, for example, the maximum operating temperature of the cation exchange resin is about 100 ° C., and the anion exchange resin is limited to about 50 ° C. It is preferable to use in such a state. This is because, for example, when ions are continuously removed under temperature conditions exceeding the operating temperature, the exchange groups are desorbed by thermal decomposition, and the performance of the ion exchange resin deteriorates, so that ions flow out as they are, so-called ion breakthrough state It becomes. Specifically, if the condensed water in the condensed water tank 75 is directly supplied to the ion exchange resin 76 in a high state of, for example, 70 ° C. or higher, the deterioration of the ion exchange resin 76 due to heat is promoted and is relatively short. This is because ion breakthrough occurs during the period.

  In addition, if the cooling water in the cooling water tank 73 is not sufficiently clean, the life of the fuel cell 51 may be reduced.

  An object of the present invention is to solve the above-described conventional problems, and to provide a fuel cell system excellent in durability by suppressing the propagation of various bacteria in condensed water and the deterioration of an ion exchange resin with a simple configuration. And

  In order to solve the above-described conventional problems, a fuel cell system of the present invention includes a fuel cell, a fuel processing device that generates fuel gas to be supplied to the fuel cell, an off-gas discharged from the fuel cell, and a fuel processing device. A condensed water tank for storing condensed water obtained from exhaust gas generated by combustion, a heater for heating and sterilizing condensed water in the condensed water tank, and a fuel cell that recovers heat generated by power generation in the fuel cell A cooling water tank provided in a cooling water circulation passage through which cooling water for maintaining the battery at a predetermined temperature circulates, a water supply pipe for replenishing the cooling water tank with the condensed water in the condensed water tank as cooling water, A pump that sends the condensed water in the condensed water tank to the cooling water tank through the water supply pipe, an ion exchange resin that is provided in the middle of the water supply pipe to process the condensed water from the condensed water tank, and ion exchange with the condensed water tank And a condensed water cooling means for cooling the condensed water is sent to the ion exchange resin is provided between the fat.

  Thereby, the condensed water in a condensed water tank can be heated with a heater, and the proliferation of microorganisms can be suppressed. Further, by cooling the condensed water sent to the ion exchange resin, deterioration due to the temperature of the ion exchange resin can be suppressed, and the life of the ion exchange resin which is a consumable part can be extended. As a result, a fuel cell system having a simple configuration and excellent durability can be provided.

  According to the present invention, a fuel cell system having a simple configuration and excellent durability can be realized.

1 is a configuration diagram of a fuel cell system according to Embodiment 1 of the present invention. Configuration diagram of a fuel cell system according to Embodiment 2 of the present invention Configuration diagram for explaining the configuration of a conventional fuel cell system

  According to a first aspect of the present invention, there is provided condensed water obtained from a fuel cell, a fuel processing device that generates fuel gas to be supplied to the fuel cell, off-gas discharged from the fuel cell, and exhaust gas generated by combustion in the fuel processing device. Condensed water tank to be stored, heater for sterilizing the condensed water in the condensed water tank, and cooling water for recovering the heat generated by power generation in the fuel cell and keeping the fuel cell at a predetermined temperature circulate A cooling water tank provided in the cooling water circulation channel, a water supply pipe for supplying the cooling water tank with the condensed water in the condensed water tank as cooling water, and the condensed water in the condensed water tank through the water supply pipe A pump for sending to the cooling water tank, an ion exchange resin provided in the middle of the water supply pipe for processing the condensed water from the condensed water tank, and provided between the condensed water tank and the ion exchange resin and sent to the ion exchange resin Condensation It is a fuel cell system including a condensed water cooling means for cooling the.

  Thereby, the condensed water in a condensed water tank can be heated with a heater, and the proliferation of microorganisms can be suppressed. Further, by cooling the condensed water sent to the ion exchange resin, deterioration due to the temperature of the ion exchange resin can be suppressed, and the life of the ion exchange resin which is a consumable part can be extended. As a result, a fuel cell system having a simple configuration and excellent durability can be provided.

  According to a second invention, in the first invention, a hot water storage tank, a hot water circulation channel for circulating the hot water so that the hot water flowing out of the hot water tank returns into the hot water storage tank, and a cooling water circulation channel are circulated. A cooling water heat exchanger that exchanges heat between the cooling water that circulates and the hot water that circulates in the hot water circulating flow path, and further, before the heat exchange with the cooling water that circulates in the cooling water circulating flow path as a condensed water cooling means. It is a fuel cell system having a condensed water heat exchanger for exchanging heat between hot water flowing through a hot water circulation path and condensed water sent to an ion exchange resin.

  Thereby, the condensed water sent to ion-exchange resin can be easily cooled with the hot water from a hot water storage tank. Moreover, the heat of the condensed water heated with the heater can be collect | recovered to hot water storage water.

  The third invention is the off-gas heat exchanger according to the second invention, wherein the off-gas heat exchanger recovers the exhaust heat of the off-gas discharged from the fuel cell by heat exchange with the hot water circulating through the hot water circulation passage and obtains condensed water from the off-gas. And an exhaust gas heat exchanger that recovers exhaust heat of exhaust gas from the fuel processing device by heat exchange with the hot water circulating through the hot water circulation path, and obtains condensed water from the exhaust gas. The fuel cell system is located on the upstream side of the hot water circulation path from the off-gas heat exchanger and the exhaust gas heat exchanger.

  Thereby, by using the hot water sent from the hot water storage tank in the lowest temperature state, the condensed water heated by the heater can be efficiently cooled and recovered.

  4th invention WHEREIN: In 2nd or 3rd invention, when the temperature detected by the stored hot water temperature detection means which detects the temperature of the stored hot water which flowed out from the hot water storage tank, and the stored hot water temperature detection means is higher than predetermined temperature A fuel cell system having pump control means for stopping the pump.

  Thereby, supply of the high temperature condensed water to an ion exchange resin can be prevented reliably.

According to a fifth invention, in the second or third invention, the hot water temperature detecting means for detecting the temperature of the hot water flowing out of the hot water tank, and the condensed water in the condensed water tank are passed through the condensed water heat exchanger. A flow path for switching the flow path switching means, a flow path switching means for switching whether the condensed water in the condensed water tank flows to the bypass pipe or the condensed water heat exchanger, and a flow path for controlling the flow path switching means. Path switching control means, the flow path switching control means, when the temperature detected by the stored hot water temperature detection means is higher than a predetermined temperature or higher than the temperature of the condensed water in the condensed water tank, the condensed water in the condensed water tank. When the temperature detected by the hot water storage temperature detection means is lower than the specified temperature or higher than the temperature of the condensed water in the condensed water tank, the condensed water in the condensed water tank is flowed to the condensed water heat exchanger. It is.

  For example, when the temperature of the hot water supplied from the hot water storage tank is relatively high, such as at the end of boiling of the hot water storage tank, the condensed water may not be cooled by the hot water and may be heated in the opposite direction.

  Thereby, when the temperature of condensed water is low, the cooling water can be replenished to the cooling water tank.

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

(Embodiment 1)
The fuel cell system according to Embodiment 1 of the present invention will be described below with reference to FIG.

  FIG. 1 is a configuration diagram of a fuel cell system according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the fuel cell system of the present embodiment has at least a fuel cell 1, a fuel processing device 2, and a hot water storage tank 3. The hot water stored in the hot water storage tank 3 is supplied from the hot water storage pump 4 to the exhaust gas heat exchanger 5 that recovers exhaust heat of the exhaust gas of the fuel processing device 2 and off gas heat exchange that recovers exhaust heat of the cathode off gas of the fuel cell 1. The hot water storage which returns to the hot water storage tank 3 via the condenser 6, the cooling water heat exchanger 7 which collect | recovers the exhaust heat of the cooling water of the fuel cell 1, and the condensed water heat exchanger which is the condensed water cooling means 11 demonstrated below. A water circulation channel 9 is provided. Hereinafter, the condensed water cooling means 11 will be described as the condensed water heat exchanger 11.

  Furthermore, the fuel cell system of the present embodiment has a heater inside, and sends condensed water to the cooling water tank 23 via the condensed water tank 25 having the condensed water temperature detecting means 21 and the water supply pipe 15. A pump 24; an ion exchange resin 26 for treating the condensed water into substantially pure water; and a condensed water heat exchanger 11 for cooling the condensed water provided between the condensed water tank 25 and the ion exchange resin 26. ing.

  Here, the condensed water tank 25 stores condensed water obtained from off-gas discharged from the fuel cell 1 and exhaust gas generated by combustion in the fuel processing device 2. The heater 27 heats and sterilizes the condensed water in the condensed water tank 25. The water supply pipe 15 supplies the cooling water tank 23 with the condensed water in the condensed water tank 25 as cooling water. The pump 24 sends the condensed water in the condensed water tank 25 to the cooling water tank 23 through the water supply pipe 15. The ion exchange resin 26 is provided in the middle of the water supply pipe 15 to process the condensed water from the condensed water tank 25 into substantially pure water. The condensed water temperature detection means 21 detects the temperature of the condensed water in the condensed water tank 25.

The condensed water heat exchanger 11 is provided at a position upstream of the exhaust gas heat exchanger 5 between the condensed water tank 25 and the ion exchange resin 26, and the temperature of the condensed water in the condensed water tank 25 is predetermined. The condensed water sent to the ion exchange resin 26 is cooled when the temperature (for example, 40 ° C.) or higher. That is, the condensed water heat exchanger 11 is provided upstream of the cooling water heat exchanger 7, the offgas heat exchanger 6, and the exhaust gas heat exchanger 5 in the hot water circulation passage 9. Here, the cooling water heat exchanger 7 recovers the exhaust heat of the cooling water of the fuel cell 1, and the off-gas heat exchanger 6 is discharged from the fuel cell 1 by heat exchange with the hot water circulating in the hot water circulation passage 9. In addition to recovering exhaust heat from the offgas, condensed water is generated from the offgas. Further, the off-gas heat exchanger 6 collects exhaust heat from the exhaust gas from the fuel processing device 2 by heat exchange with the hot water circulating in the hot water circulation channel 9 and generates condensed water from the exhaust gas. In addition, as the condensed water heat exchanger 11, heat exchangers, such as a double tube type, a shell and tube type, a plate type, are used, for example.

  Further, the fuel cell 1 uses a fuel gas (for example, hydrogen) generated by the fuel processing device 2 and oxygen in the air sent from an air blower or the like as an anode 12 as a fuel electrode and a cathode as an oxygen electrode. In 13, electricity is generated by electrochemical reaction. And since the fuel cell 1 produces | generates water by reaction of fuel gas and oxygen simultaneously, the off gas containing many water vapor | steam components is discharged | emitted from the cathode 13 of the fuel cell 1. FIG.

  On the other hand, the fuel processing device 2 generates hydrogen from a raw material gas such as methane or propane by a reforming reaction (for example, a steam reforming reaction) using a catalyst, and sends the hydrogen to the anode 12 of the fuel cell 1. And since the fuel processing apparatus 2 generally accelerates | stimulates a reforming reaction using the combustion heat of raw material gas, the combustion exhaust gas containing many water vapor | steam components is discharged | emitted.

  Further, the cooling water 14 stored in the cooling water tank 23 is supplied to the cooling unit 14 of the fuel cell 1 by the cooling water circulation pump 10, and circulates between the cooling water heat exchanger 7 through the cooling water circulation passage 8. .

  The fuel cell system according to the present embodiment also includes hot water temperature detecting means 28 for detecting the temperature of hot water flowing out from the hot water storage tank 3 and a pump control means 29. And the pump control means 29 stops the pump 24, when the temperature detected by the stored hot water temperature detection means 28 is higher than predetermined temperature (for example, 40 degreeC).

  In this case, the hot water stored in the lower part of the hot water storage tank 3 is sent to the hot water circulation channel 9 by the hot water storage pump 4, and the exhaust gas heat exchanger 5 recovers the heat of the combustion exhaust gas discharged from the fuel processing device 2 to raise the temperature. Is done. Then, the heat of the cathode offgas discharged from the cathode 13 of the fuel cell 1 is recovered by the offgas heat exchanger 6 and the temperature is raised. Further, the cooling water heat exchanger 7 recovers the heat of the cooling water of the fuel cell 1 circulating through the cooling water circulation passage 8 and raises the temperature. Finally, it is sent to the upper part of the hot water storage tank 3 to form temperature stratification in the hot water storage tank 3.

  And the hot water from the hot water storage tank 3 is performed by supplying tap water from the lower part of the hot water storage tank 3 and pushing out hot water from the upper part.

  In addition, as the exhaust gas heat exchanger 5, the off-gas heat exchanger 6, and the cooling water heat exchanger 7, for example, a shell-and-tube type or a plate type heat exchanger is used.

  Further, in the fuel cell system of the present embodiment, the exhaust gas from the fuel processing device 2 is combustion exhaust gas containing a water vapor component and is cooled by the hot water stored in the hot water storage tank 3 in the exhaust gas heat exchanger 5 to be condensed with the exhaust gas. Produce water. Similarly, the off gas from the cathode 13 of the fuel cell 1 is also air containing a water vapor component, and is cooled by the hot water stored in the hot water storage tank 3 in the off gas heat exchanger 6 to generate off gas condensed water. Thereafter, the exhaust gas condensed water and the off gas condensed water are separated into a condensed water component and a gas component in the gas-liquid separator 20, and the off gas and the exhaust gas as gas components are exhausted to the outside, and the condensed water is supplied to the condensed water tank 25. Stored.

The condensed water collected in the condensed water tank 25 is supplied to the cooling water tank 23 through the water supply pipe 15 by the pump 24 and used as the cooling water for the fuel cell 1. For this reason, the cooling water of the fuel cell 1 is generally required to have cleanness that does not contain impurities from the viewpoint of extending the life of the fuel cell 1. Therefore, the condensed water generated from the exhaust gas of the fuel processing device 2 and the off-gas of the fuel cell 1 contains some carbonaceous components from the exhaust gas and impurities eluted from the constituent materials. And supplied to the cooling water tank 23.

  However, the condensed water in the condensed water tank 25 is substantially pure water having some impurities, and does not contain a chlorine component having a bactericidal action like ordinary city water. The condensed water tank 25 is generally open to the outside air. That is, the condensed water in the condensed water tank 25 is in an environment in which various germs are likely to propagate. Therefore, if a large number of germs propagate in the condensed water, it causes clogging in the pump 24 for supplying the cooling water and the ion exchange resin 26 as a pure water treatment device, and the liquid feeding to the cooling water tank 23 is hindered and the cooling water is insufficient. Cause.

  Therefore, the condensed water collected in the condensed water tank 25 is heat sterilized by the heater 27 to suppress the growth of microorganisms. In the heat sterilization, for example, the temperature of the condensed water in the condensed water tank 25 is detected by the condensed water temperature detecting means 21, and periodically (for example, once a day) and at a predetermined temperature (for example, 70 ° C. or more), For example, it is sterilized by heating for about 5 seconds.

  Thereby, the condensed water can be periodically heat sterilized with a heater to prevent the growth of microorganisms.

  Except for the period in which the condensed water is heated and sterilized by the heater, the condensed water heat exchanger 11 cools the condensed water and ion-exchanges the condensed water with an ion exchange resin, and the cooling water tank 23 is supplied. As a result, since the high-temperature condensed water does not always flow through the ion exchange resin, deterioration of the ion exchange resin such as ion breakthrough can be suppressed over a long period of time.

  According to the present embodiment, the condensed water in the condensed water tank 25 can be heated by the heater 27 to suppress the growth of microorganisms. Furthermore, by cooling the condensed water sent to the ion exchange resin 26, deterioration due to the temperature of the ion exchange resin 26 can be suppressed. As a result, pure water can be stably supplied to the cooling water tank 23 over a long period of time, and the life of the ion exchange resin 26 that is a consumable part can be extended.

  Moreover, according to this Embodiment, the condensed water sent to the ion exchange resin 26 can be easily cooled by utilizing the hot water stored in the hot water storage tank 3 for cooling the condensed water. Furthermore, since the heat of the condensed water heated by the heater 27 can be recovered in the hot water storage, energy saving can be improved.

  Further, according to the present embodiment, the condensate heat exchanger 11 is disposed upstream of the off-gas heat exchanger 6 and the exhaust gas heat exchanger 5 in the hot water storage circulation path 9, and the hot water stored in the hot water storage tank 3 is supplied. By using it in the lowest temperature state, the condensed water heated by the heater 27 can be efficiently cooled and recovered.

  Further, according to the present embodiment, the condensed water is heated without being cooled by the hot water under the condition that the temperature of the hot water supplied from the hot water tank 3 at the end of boiling of the hot water tank 3 is relatively high. In such a case, the hot water temperature detecting means 28 for detecting the temperature of the hot water flowing out of the hot water storage tank 3 and the pump 24 is stopped when the temperature detected by the hot water temperature detecting means 28 is higher than a predetermined temperature (for example, 40 ° C.). The pump control means 29 can reliably prevent the supply of hot condensed water to the ion exchange resin 26.

  That is, according to the present embodiment, it is possible to realize a fuel cell system with a simple configuration and excellent durability and energy saving.

(Embodiment 2)
The fuel cell system according to Embodiment 2 of the present invention will be described below with reference to FIG.

  FIG. 2 is a configuration diagram of the fuel cell system according to Embodiment 2 of the present invention. Note that the configuration and operation of the fuel cell system according to the present embodiment are substantially the same as those described in the first embodiment, and thus detailed description thereof is omitted.

  That is, as shown in FIG. 2, the bypass pipe 30 for sending the condensed water in the condensed water tank 25 to the ion exchange resin 26 without passing through the condensed water heat exchanger 11, and the condensed water in the condensed water tank 25. Embodiment 1 in that a flow path switching means 31 for switching between flowing through the bypass pipe 30 or the condensed water heat exchanger 11 and a flow path switching control means 32 for controlling the flow path switching means 31 are provided. Is different. Then, the flow path switching control means 32 determines whether the temperature detected by the stored hot water temperature detection means 28 is higher than a predetermined temperature (for example, 40 ° C.) or the condensed water in the condensed water tank 25 detected by the condensed water temperature detection means 21. When the temperature is higher, the condensed water in the condensed water tank 25 is caused to flow through the bypass pipe 30. On the other hand, when the temperature detected by the stored hot water temperature detecting means 28 is not more than a predetermined temperature or not more than the temperature of the condensed water in the condensed water tank 25, the condensed water in the condensed water tank 25 is caused to flow to the condensed water heat exchanger 11. It is.

  Thus, for example, when the temperature of the hot water supplied from the hot water storage tank at the end of boiling of the hot water storage tank is relatively high, the condensate is not cooled by the hot water but is heated on the contrary, By flowing, the rise in the temperature of the condensed water can be suppressed. Further, when the temperature of the condensed water is low, the cooling water tank can be replenished directly using the condensed water as the cooling water.

  In the fuel cell system according to the present invention, the cooling means for cooling the condensed water sent to the ion exchange resin can suppress the growth of bacteria in the condensed water and the deterioration due to the temperature of the ion exchange resin. This is useful in technical fields such as cogeneration using batteries.

DESCRIPTION OF SYMBOLS 1 Fuel cell 2 Fuel processing apparatus 3 Hot water storage tank 4 Hot water storage pump 5 Exhaust gas heat exchanger 6 Off-gas heat exchanger 7 Cooling water heat exchanger 8 Cooling water circulation channel 9 Hot water circulation channel 10 Cooling water circulation pump 11 Condensate water heat exchanger ( Condensate cooling means)
DESCRIPTION OF SYMBOLS 12 Anode 13 Cathode 14 Cooling part 15 Water supply pipe 20 Gas-liquid separator 21 Condensed water temperature detection means 23 Cooling water tank 24 Pump 25 Condensed water tank 26 Ion exchange resin 27 Heater 28 Hot water storage water temperature detection means 29 Pump control means 30 Bypass Pipe 31 Channel switching means 32 Channel switching control means

Claims (5)

Condensation for storing condensed water obtained from a fuel cell, a fuel processing device that generates fuel gas to be supplied to the fuel cell, off-gas discharged from the fuel cell, and exhaust gas generated by combustion in the fuel processing device A water tank, a heater for heating and sterilizing the condensed water in the condensed water tank, and a cooling water for recovering heat generated during power generation in the fuel cell and maintaining the fuel cell at a predetermined temperature circulate A cooling water tank provided in the cooling water circulation channel, a water supply pipe for supplying the cooling water tank with the condensed water in the condensed water tank as cooling water, and the condensed water in the condensed water tank A pump that feeds the cooling water tank through a water supply pipe, an ion exchange resin that is provided in the middle of the water supply pipe to treat the condensed water from the condensed water tank, the condensed water tank, and the ion exchange tree Fuel cell system including a condensed water cooling means for cooling the condensed water to be sent to the ion exchange resin is provided between the. A hot water storage tank, a hot water circulation path for circulating the hot water so that the hot water flowing out of the hot water tank returns to the hot water storage tank, a cooling water circulating through the cooling water circulation path, and the hot water circulation path A cooling water heat exchanger for exchanging heat with the hot water circulating through
Further, the condensed water heat for exchanging heat between the hot water flowing through the hot water storage water circulation channel before heat exchange with the cooling water circulating through the cooling water circulation channel as the condensed water cooling means and the condensed water sent to the ion exchange resin. The fuel cell system according to claim 1, further comprising an exchanger. An off-gas heat exchanger that recovers the exhaust heat of the off-gas discharged from the fuel cell by exchanging heat with the hot-water storage water circulating in the hot-water storage circulation channel and obtains condensed water from the off-gas, and circulates in the hot-water storage circulation channel An exhaust gas heat exchanger that recovers exhaust heat of the exhaust gas from the fuel processing device by heat exchange with the stored hot water and obtains condensed water from the exhaust gas, and the condensed water heat exchanger includes the off-gas heat exchanger 3. The fuel cell system according to claim 2, wherein the fuel cell system is located upstream of the exhaust gas heat exchanger in the hot water circulation path. Hot water storage temperature detection means for detecting the temperature of hot water flowing out of the hot water storage tank, and pump control means for stopping the pump when the temperature detected by the hot water storage temperature detection means is higher than a predetermined temperature. 4. The fuel cell system according to 2 or 3. Hot water temperature detecting means for detecting the temperature of hot water flowing out from the hot water storage tank, and a bypass pipe for sending the condensed water in the condensed water tank to the ion exchange resin without passing through the condensed water heat exchanger And a flow path switching means for switching whether the condensed water in the condensed water tank flows to the bypass pipe or the condensed water heat exchanger, and a flow path switching control means for controlling the flow path switching means. The flow path switching control means bypasses the condensed water in the condensed water tank when the temperature detected by the stored hot water temperature detecting means is higher than a predetermined temperature or higher than the temperature of the condensed water in the condensed water tank. When the temperature detected by the hot water storage temperature detection means is lower than a predetermined temperature or higher than the temperature of the condensed water in the condensed water tank, the condensed water in the condensed water tank is transferred to the condensed water heat exchanger. Shed The fuel cell system according to Motomeko 2 or 3.

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