JP2005183109A - Fuel cell power generation system and operation method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell power generation system and its operation method that aims at performing a water quality management in which contaminant ions of water circulaton system can be kept under the permissible value for a long period of time. <P>SOLUTION: A fuel cell power generation system includes a fuel cell stack 1, a fuel cell water circulation system 2 for supplying water to the fuel cell stack 1, an electrolytic water device 12 that is provided with a DC voltage source to apply DC voltage to an anode 12a and a cathode 12b and across these poles and performs electrolytic processing of the water supplied from a water supply source, and an anode electrolytic water supply system for supplying the electrolytic water created at the anode 12a of the electrolytic water device 12 to the fuel cell water circulation system 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fuel cell power generation system that generates power using a solid polymer fuel cell and an operation method thereof.

  The fuel cell power generation system supplies a fuel such as hydrogen and an oxidant such as air to the fuel cell body and causes them to react electrochemically, thereby converting the chemical energy of the fuel directly into electrical energy and taking it out. It is a power generation device.

  This fuel cell power generation system is characterized by being highly efficient and environmentally friendly despite its relatively small size, and by collecting the heat generated by power generation as hot water or steam, a cogeneration system Can be applied.

  By the way, the fuel cell main body is classified into various types depending on the difference in electrolytes, etc., but the polymer electrolyte fuel cell using the solid polymer electrolyte membrane as the electrolyte has features such as low temperature operability and high output density. Therefore, it is suitable for use as a power source for small-sized cogeneration systems and electric vehicles with a view to general households, and the market size is expected to expand rapidly in the future.

  In this solid polymer fuel cell, for example, a fluorine ion exchange membrane is used as the solid polymer electrolyte membrane. These membranes have a proton exchange group in the molecule, exhibit proton conductivity by containing water, and function as an electrolyte. Therefore, if the water content of the battery is small, the proton conductivity of the solid polymer electrolyte membrane is lowered, and the battery performance is lowered. Therefore, the fuel cell is supplied by an external humidification method in which the reaction gas supplied to the fuel cell is humidified in advance and supplied to the fuel cell, or an internal humidification method in which humidified water is directly supplied to the fuel cell together with the reaction gas. It is necessary to supply water vapor or water to the electrode reaction part to keep the water content of the solid polymer electrolyte membrane within an appropriate range.

  On the other hand, since the reaction accompanying the power generation of the fuel cell is an exothermic reaction, a cooling plate is inserted into the fuel cell stack and cooled with sensible heat of the cooling water, or humidified water supplied with the reaction gas in the internal humidification system. The fuel cell is controlled to an appropriate temperature range by a method of cooling with latent heat of evaporation.

  As described above, it is necessary to supply cooling water or humidified water to the fuel cell stack. In order to minimize the makeup water from the outside, the water discharged from the fuel cell stack is circulated to the fuel cell stack. A water circulation system is provided. However, this water circulation system is in an environment where impurities such as metal ions are mixed due to corrosion of the metal material.

  In the internal humidification method, when metal ions mixed in the water circulation system are mixed into the humidified water and supplied to the battery body, the proton exchange groups present in the electrolyte membrane and electrode catalyst constituting the battery are replaced with metal ions. Battery voltage decreases.

  Furthermore, as an issue common to the internal humidification method and the external humidification method, when the electromotive force is generated in the fuel cell, if the electrical conductivity of the cooling water penetrating the fuel cell stack increases due to the mixing of metal ions or the like, The insulation of the fuel cell stack is broken, and there is a problem that a ground fault through cooling water, corrosion of the constituent material of the fuel cell stack, and the like occur.

  Therefore, water quality management of the water circulation system of the fuel cell power generation system is an important issue in maintaining the performance and safety of the fuel cell.

Therefore, at present, a method of managing the water quality by arranging an ion exchange resin in the water circulation system of the fuel cell is widely used. (For example, publicly known document 1)
FIG. 9 is a block diagram showing an example of such a conventional fuel cell power generation system.

As shown in FIG. 9, the fuel cell power generation system includes a fuel cell stack 1 and a fuel cell water circulation system 2 in which cooling water or humidified water circulates so as to penetrate the fuel cell stack 1. The water tank 3, the water pump 4, the ion exchange resin 5, and the heat exchanger 6 that recovers heat generated by the fuel cell are disposed. A water supply source 7 is connected to the water tank 3 via a water supply valve 8 so that water can be replenished at any time by opening and closing the water supply valve 8. Excess water is discharged from an auto drain 9 provided in the water tank 3.
JP2002-141095

  As described above, the conventional water quality management method using the ion exchange resin has an advantage that the impurity ions can be reduced to the allowable value or less with a simple configuration, but the ion exchange resin is frequently exchanged because the life of the resin is short. This necessitates a major inconvenience in operation management. In addition, since costs are required for the ion exchange resin itself and replacement work, it is practically difficult to maintain metal ions below a permissible value at all times, particularly in a small cogeneration system with a view to general household use.

  The present invention has been made to solve the above-described problems, and provides a fuel cell power generation system capable of performing water quality management capable of maintaining impurity ions in a water circulation system below an allowable value for a long period of time, and an operating method thereof. For the purpose.

  The invention corresponding to claim 1 comprises a fuel cell stack, a fuel cell water circulation system for supplying water to the fuel cell stack, an anode and a cathode, and a DC voltage source for applying a DC voltage between the two electrodes. An electrolyzed water device that electrolyzes the water supplied from the electrolyzed water, and an anodic electrolyzed water supply system that supplies electrolyzed water generated at the anode of the electrolyzed water device to the fuel cell water circulation system.

  The invention corresponding to claim 2 includes a fuel cell stack, a fuel cell water circulation system for supplying water to the fuel cell stack, an ion exchanger provided in the fuel cell water circulation system, an anode and a cathode, and a gap between the two electrodes. A DC voltage source for applying a DC voltage to the electrolyzed water device that electrolyzes water supplied from a water supply source, and electrolyzed water generated at the anode of the electrolyzed water device to supply and drain water to the ion exchanger An anodic electrolyzed water supply system and an anodic electrolyzed water discharge system are provided.

  According to a third aspect of the present invention, in the fuel cell power generation system of the first or second aspect of the present invention, a reverse osmosis membrane device is disposed in a water supply system connected from the water supply source to the electrolyzed water device.

  According to a fourth aspect of the present invention, there is provided a fuel cell stack, a fuel cell water circulation system for supplying water to the fuel cell stack, a water supply system, a direct current voltage for applying a direct current voltage between the anode and the cathode and both electrodes. An electrolyzed water device that electrolyzes clean water supplied from the clean water supply system with a source, a cathodic electrolyzed water supply system that supplies electrolyzed water generated at the cathode of the electrolyzed water device to a drinking water system, and An anode electrolyzed water supply system for supplying electrolyzed water generated at the anode of the electrolyzed water device to the fuel cell water circulation system.

  According to a fifth aspect of the present invention, in the fuel cell power generation system according to the fourth aspect of the present invention, a reverse osmosis membrane device is disposed in a water supply system connected from the clean water supply system to the electrolyzed water device.

  According to a sixth aspect of the present invention, there is provided a fuel cell power generation system according to any one of the first to fifth aspects, wherein the direct-current power output from the fuel cell is used as a direct-current voltage source applied to the electrolyzed water device. Is used.

  The invention corresponding to claim 7 is a fuel cell power generation system operating method according to any one of claims 1 to 6, wherein the electrolyzed water generated at the anode of the electrolyzed water device is predetermined. The fuel cell water circulation system is supplied at intervals.

  The invention corresponding to claim 8 is the operation method of the fuel cell power generation system of the invention corresponding to claim 3 or claim 5, further comprising a drinking water use valve disposed upstream of the drinking water system. When the use valve is opened, the electrolyzed water generated at the anode of the electrolyzed water device is supplied to the fuel cell water circulation system.

  The invention corresponding to claim 9 is the operation method of the fuel cell power generation system of the invention corresponding to claim 6, when the power output from the fuel cell power generation system is excessive than the power demand, from the fuel cell. The output DC power is applied to the electrolyzer.

  INDUSTRIAL APPLICABILITY The present invention can perform water quality management that can keep impurity ions in the water circulation system below an allowable value for a long period of time.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a first embodiment of a fuel cell power generation system according to the present invention. The same parts as those in FIG.

  As shown in FIG. 1, the fuel cell stack 1 includes a fuel cell water circulation system 2 in which cooling water or humidified water circulates so as to penetrate the fuel cell stack 1. A water pump 4, an ion exchanger 5 and a heat exchanger 6 for recovering heat generated by the fuel cell are arranged.

  In addition, an electrolyzed water device 12 is connected to the water tank 3 through an anode electrolyzed water supply pipe 10, and an anode electrolyzed water supply valve 11 is provided in the anode electrolyzed water supply pipe 10.

  The electrolyzed water device 12 includes an anode 12a, a cathode 12b, and a DC power source 13 provided between the two electrodes, and has a function of electrolyzing water supplied from the water supply source 7 by applying a DC voltage. .

  The water tank 3 is provided with an auto drain 9, and excess water is discharged from the auto drain 9.

  Next, the operation of the fuel cell power generation system configured as described above will be described.

  The water supplied from the water supply source 7 to the electrolyzed water device 12 is electrolyzed when a DC voltage is applied between the anode 12a and the cathode 12b of the electrolyzed water device by the DC power source 13. At this time, cations typified by metal ions are attracted to the cathode side, so that anodic electrolyzed water having a metal ion concentration lower than that of water supplied from the water supply source is generated in the vicinity of the anode. Further, the electrolytic treatment causes a reaction of the following formula at the anode, so that the proton concentration of the anode electrolyzed water increases.

(Reaction formula at the anode): 2H ₂ O → O ₂ + 4H ⁺ + 4e ⁻
By supplying anodic electrolyzed water having the above properties to the fuel cell water circulation system 2, the metal ion concentration of the fuel cell water circulation system 2 is higher than when water from the water supply source 7 is directly supplied to the fuel cell water circulation system 2. Is reduced.

  Furthermore, when the fuel cell is contaminated with metal ions, anodic electrolyzed water having a high proton concentration is supplied, so that the metal ions present in the ion exchange groups constituting the electrodes of the fuel cell are re-substituted with protons, Metal ions are removed.

  Thus, according to this embodiment, since the metal ion concentration of the water supplied to the ion exchanger 5 arranged in the fuel cell water circulation system is reduced, the life of the ion exchange resin is improved. Therefore, it is possible to reduce the maintenance cost associated with the replacement of the ion exchange resin, and it is possible to prevent the performance of the fuel cell from being deteriorated due to contamination by metal ions.

  Furthermore, when the fuel cell is contaminated with metal ions, anode electrolytic water having a high proton concentration is supplied to the fuel cell, so that the metal ions on the proton exchange groups contained in the catalyst layer and the electrolyte membrane are protons. Re-replacement is performed to remove metal ions that have contaminated the fuel cell. Therefore, the performance of the fuel cell is recovered, and a decrease in the performance of the fuel cell can be suppressed.

  In the first embodiment, water is supplied from the water supply source 7 to the electrolyzed water device 12, and the electrolyzed anode electrolyzed water is supplied to the fuel cell water circulation system 2. However, as shown in FIG. Even if the electrolyzed water device 12 is arranged so that the anodic electrolyzed water electrolyzed on the outlet side of the water tank 3 is supplied to the fuel cell water circulation system 2, the same effect as the above embodiment can be obtained.

  Further, when the timing of water replenishment is short, even if the ion exchanger 5 is omitted from the fuel cell water circulation system 2 as shown in FIG.

  FIG. 4 is a block diagram showing a second embodiment of the fuel cell power generation system according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

  In 2nd Embodiment, it was set as the structure which provides the switching valve 14a and the ion exchanger drainage port 14b downstream of the ion exchanger 5 arrange | positioned at the fuel cell water circulation system 2, Other structures are the same as that of FIG. is there.

  Next, the operation of the fuel cell power generation system configured as described above will be described.

  When water is supplied from the water supply source 7 to the electrolyzed water device 12, the water is electrolyzed to generate anodic electrolyzed water having a low metal ion concentration and a high proton concentration. This anodic electrolyzed water is once stored in the water tank 3 via the anodic electrolyzed water supply pipe 10 a and then supplied to the ion exchanger 5. Therefore, when the anode electrolyzed water having a high proton concentration is supplied to the ion exchanger 5, the metal ions contained in the ion exchange resin are regenerated with protons, and the water containing the metal ions generated along with the regeneration is The switching valve 14a is discharged by switching to the ion exchanger outlet 14b side.

  Thus, according to this embodiment, it is possible to regenerate the ion exchange resin without taking out the ion exchanger 5 from the system. Therefore, it is possible to reduce the maintenance cost associated with the replacement of the ion exchange resin, and it is possible to prevent the performance of the fuel cell from being deteriorated due to contamination by metal ions.

  FIG. 5 is a block diagram showing a third embodiment of the fuel cell power generation system according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

  In the third embodiment, the anode electrolyzed water supply pipe 10a and the cathode electrolyzed water supply pipe 10b are respectively connected to the anode 12a and the cathode 12b of the electrolyzed water device 12, and the anode electrolyzed water supply pipe 10a is connected to the anode electrolyzed water supply valve 11. The water supply is supplied from the water supply source 15 as a configuration in which the cathode electrolyzed water supply pipe 10b is connected to the drinking water use port 16 and the other configuration is shown in FIG. It is the same.

  Next, the operation of the fuel cell power generation system configured as described above will be described.

  The clean water supplied from the clean water supply source 15 is electrolyzed by applying a DC voltage of the DC power supply 13 between the anode 12 a and the cathode 12 b of the electrolyzed water device 12. At this time, metal ions mainly composed of minerals contained in clean water are attracted to the cathode side, and the cathodic electrolyzed water generated at the cathode is dehydrated from the cathodic electrolyzed water supply pipe 10b via the drinking water use port 16. It is used as drinking water containing a lot.

  On the other hand, in the anode of the electrolyzed water device 12, anode electrolyzed water having a reduced metal ion concentration and an increased proton concentration is generated as compared with clean water supplied from a clean water supply source, and is disposed in the fuel cell water circulation system 2. The ion exchanger 5 is supplied in the same manner as described above.

  According to the present embodiment, since the metal ion concentration of water supplied to the ion exchanger 5 disposed in the fuel cell water circulation system 2 is reduced as in the first embodiment, maintenance accompanying the replacement of the ion exchange resin is performed. The cost can be reduced, and the deterioration of the performance of the fuel cell due to contamination by metal ions can be prevented.

  In addition, when the fuel cell is contaminated with metal ions, anode electrolyzed water having a high proton concentration is supplied to the fuel cell, so that the metal ions on the proton exchange groups contained in the catalyst layer and the electrolyte membrane are protons. Re-replacement is performed to remove metal ions that have contaminated the fuel cell. Therefore, the performance of the fuel cell is recovered, and a decrease in the performance of the fuel cell can be suppressed.

  Furthermore, according to the fuel cell power generation system of the present embodiment, the cathode electrolyzed water is produced from the tap water and used as drinking water, and at the same time, the anode electrolyzed water produced as a by-product can be used as the fuel cell supply water. The effect of saving the water bill accompanying it is also obtained.

  FIG. 6 is a block diagram showing a fourth embodiment of the fuel cell power generation system according to the present invention. The same parts as those in FIG. 5 are denoted by the same reference numerals, and the description thereof is omitted. Different parts will be described here.

  In 4th Embodiment, it is set as the structure which provides the reverse osmosis membrane device 17 for drinking water water purification in the water supply piping 15a, and supplies the clean water which passed this reverse osmosis membrane device 17 to the electrolyzed water apparatus 12. Other configurations are the same as those in FIG.

  Next, the operation of the fuel cell power generation system configured as described above will be described.

  Since the heavy metal and chlorine compounds in the clean water are removed from the clean water supplied from the clean water supply source 15 by the reverse osmosis membrane device 17, heavy metal ions and anodic electrolysis in the catholyzed water electrolyzed by the electrolyzed water device 12 are used. The chloride ion concentration in water decreases. That is, the heavy metal ions supplied to the drinking water system are reduced, and the concentration of chloride ions supplied to the ion exchanger 5 disposed in the fuel cell water supply system 2 is reduced.

  According to the present embodiment, when producing cathodic electrolyzed water from tap water and using it as drinking water, heavy metal ions that have an adverse effect on the human body are removed by the reverse osmosis membrane device 17 and by-produced anodic electrolysis Since the concentration of metal ions and chloride ions in the water is reduced, the concentration of metal ions and chloride ions in the fuel cell water circulation system water 2 is reduced. Therefore, it is possible to reduce the maintenance cost associated with the replacement of the ion exchange resin, and it is possible to prevent the performance of the fuel cell from being deteriorated due to contamination by metal ions.

  Furthermore, in this embodiment, since the reverse osmosis membrane is used for the purpose of reducing heavy metals in the drinking water system, there is an effect that no new cost is involved.

  Next, the best operation method of the fuel cell power generation system according to the fourth embodiment of the present invention will be described.

  The anode electrolyzed water supply valve 11 was opened at a preset timing based on the water quality of the environment where the fuel cell power generation system is installed, and the anode electrolyzed water was supplied to the fuel cell water circulation system 2. Here, in synchronism with the supply of the anodic electrolyzed water, the cathodic electrolyzed water is supplied to the cathodic electrolyzed water tank 18, and then the electrolyzed water device 12 is supplied with the clean water via the water supply pipe. did.

  The fuel cell water circulation system 2 is always maintained at a conductivity below the allowable value by performing the operation in which the anode electrolytic water having a low metal ion concentration is replenished to the fuel cell water supply system 2 at the preset timing. .

  According to this embodiment, since the anode electrolyzed water having a low metal ion concentration is periodically replenished, the amount of metal ions supplied to the ion exchanger 5 is reduced. Therefore, it is possible to reduce the maintenance cost associated with the replacement of the ion exchange resin, and it is possible to prevent the performance of the fuel cell from being deteriorated due to contamination by metal ions.

  FIG. 7 is a block diagram showing a fifth embodiment of the fuel cell power generation system according to the present invention. The same components as those in FIG. 6 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

  In the fifth embodiment, the anode 12a of the electrolyzed water device 12 is directly connected to the water tank 3 by the anode electrolyzed water supply pipe 10a, and the catholyte water supply pipe 10b is connected to the potable water use port 16 through the potable water use valve 19. The other configurations are the same as those in FIG.

  Next, the operation of the fuel cell power generation system configured as described above will be described.

  When the drinking water use valve 19 is opened due to a request for drinking water use, cathodic electrolyzed water is supplied to the drinking water use pipe 10b. In synchronism with this, anodic electrolyzed water is supplied to the water tank 3 via the anodic electrolyzed water supply pipe 10 a and supplied to the fuel cell water circulation system 2. Thereafter, clean water is supplied to the electrolyzed water device 12 via the clean water pipe.

  In addition, since the anode electrolyzed water having a reduced metal ion concentration is supplied to the fuel cell water circulation system 2 at the timing of use of the drinking water, the fuel cell circulation water system 2 has a high demand for drinking water and a high outdoor temperature. Is particularly replenished.

  Thus, during periods when demand for drinking water is high, the outside air temperature and the temperature of clean water are high. Therefore, in the fuel cell power generation system that recovers the moisture in the exhaust gas by exchanging the exhaust gas supplied to the heat exchanger 6 with the outside air or clean water, the capacity of the heat exchanger 6 is increased, It is necessary to replenish water.

  However, in the fuel cell power generation system according to the present embodiment, in addition to the water quality maintenance effect and the cost reduction effect associated with water replenishment described in the fourth embodiment, the capacity of the heat exchanger can be reduced to achieve compactness. . Moreover, since complicated control is not used when supplying anode electrolyzed water to the fuel cell water circulation system, an effect of simplifying system control can be obtained.

  FIG. 8 is a block diagram showing a sixth embodiment of the fuel cell power generation system according to the present invention. The same parts as those in FIG. 7 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

  In FIG. 8, a solid line indicates a water pipe, and a broken line indicates an electrical wiring.

  In the sixth embodiment, a configuration in which an electromotive force of a fuel cell adjusted by a DC / DC converter 20 is used as a DC voltage source.

  In the fuel cell power generation system configured as described above, when there is a surplus in the output from the fuel cell, an operation of producing electrolyzed water was performed.

  If such an operation is performed, the DC power output from the fuel cell is adjusted to a predetermined DC voltage by the DC / DC converter 20 and used directly in the electrolysis treatment of the electrolyzed water device 12. Therefore, the energy loss resulting from the conversion efficiency between direct current and alternating current can be removed. Moreover, the fluctuation of the output of the fuel cell is reduced by performing the electrolytic treatment when the power is surplus.

  According to this embodiment, since conversion between direct current and alternating current is not involved, it is possible to reduce power consumption during electrolytic treatment. In addition, since the output fluctuation range of the fuel cell is reduced, the system control can be simplified.

The block diagram which shows 1st Embodiment of the fuel cell power generation system by this invention. The block diagram which shows the 1st modification of the embodiment. The block diagram which similarly shows the 2nd modification. The block diagram which shows 2nd Embodiment of the fuel cell power generation system by this invention. The block diagram which shows 3rd Embodiment of the fuel cell power generation system by this invention. The block diagram which shows 4th Embodiment of the fuel cell power generation system by this invention. The block diagram which shows 5th Embodiment of the fuel cell power generation system by this invention. The block diagram which shows 6th Embodiment of the fuel cell power generation system by this invention. The block diagram which shows an example of the conventional fuel cell power generation system.

Explanation of symbols

  1: Fuel cell stack, 2: Fuel cell water circulation system, 3: Water tank, 4: Water pump, 5: Ion exchanger, 6: Heat exchanger, 7: Water supply source, 8: Water supply valve, 9: Auto Drain, 10a: anode electrolyzed water supply pipe, 10b: cathode electrolyzed water supply pipe, 11: anode electrolyzed water supply valve, 12: electrolyzed water apparatus, 12a: electrolyzed water apparatus anode, 12b: electrolyzed water apparatus cathode, 13: DC voltage 14a: Switching valve, 14b: Ion exchanger drain, 15: Water supply source, 15a: Water supply piping, 16: Drinking water utilization system, 17: Reverse osmosis membrane device, 18: Cathodic electrolyzed water tank, 19 : Drinking water use valve, 20: DC / DC converter

Claims (9)

  A fuel cell stack, a fuel cell water circulation system for supplying water to the fuel cell stack, an anode, a cathode, and a DC voltage source for applying a DC voltage between the two electrodes, and electrolytically treating water supplied from the water supply source A fuel cell power generation system comprising: an electrolyzed water device; and an anode electrolyzed water supply system that supplies electrolyzed water generated at an anode of the electrolyzed water device to the fuel cell water circulation system.   A fuel cell stack, a fuel cell water circulation system for supplying water to the fuel cell stack, an ion exchanger provided in the fuel cell water circulation system, a direct current voltage source for applying a direct current voltage between the anode and the cathode and both electrodes An electrolyzed water device that electrolyzes water supplied from a water supply source, and an electrolyzed water supply system that supplies and drains the electrolyzed water generated at the anode of the electrolyzed water device to the ion exchanger and anodic electrolysis A fuel cell power generation system comprising a water discharge system.   The fuel cell power generation system according to claim 1 or 2, wherein a reverse osmosis membrane device is disposed in a water supply system connected from the water supply source to the electrolyzed water device.   A fuel cell stack, a fuel cell water circulation system for supplying water to the fuel cell stack, a water supply system, an anode and a cathode, and a DC voltage source for applying a DC voltage between the two electrodes; An electrolyzed water device that electrolyzes the supplied water, a cathodic electrolyzed water supply system that supplies electrolyzed water generated at the cathode of the electrolyzed water device to a drinking water system, and an anode of the electrolyzed water device. An anode electrolyzed water supply system for supplying electrolyzed water to the fuel cell water circulation system.   5. The fuel cell power generation system according to claim 4, wherein a reverse osmosis membrane device is disposed in a water supply system connected from the water supply system to the electrolyzed water device.   6. The fuel cell power generation system according to claim 1, wherein DC power output from a fuel cell is used as a DC voltage source applied to the electrolyzed water device.   The fuel cell power generation system according to any one of claims 1 to 6, wherein the electrolyzed water generated at the anode of the electrolyzed water device is supplied to the fuel cell water circulation system at a predetermined interval. how to drive.   A drinking water utilization valve disposed upstream of the drinking water system, and when the drinking water utilization valve is opened, the electrolytic water generated at the anode of the electrolytic water device is supplied to the fuel cell water circulation system. 6. A method of operating a fuel cell power generation system according to claim 3 or claim 5, wherein   7. The fuel cell power generation system according to claim 6, wherein when the power output from the fuel cell power generation system is excessive than the power demand, DC power output from the fuel cell is applied to the electrolyzer. Driving method.

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