JP2021093286A - Fuel cell power generation system and control method of fuel cell power generation system - Google Patents

Abstract

To provide a fuel cell power generation system and a control method of the fuel cell power generation system that can suppress propagation of bacteria in a water tank which accumulates cooling-water drained from a fuel cell.SOLUTION: A fuel cell power generation system according to the present embodiment comprises: a fuel cell; a water tank; a first cooling heat-exchanger; and a controller. The water tank accumulates cooling-water. The first cooling heat-exchanger is arranged at a position being at a downstream side of the fuel cell of a cooling-water path for circulating the cooling-water between the fuel cell and the water tank and at an upstream side of the water tank, and cools the cooling-water. The controller controls at least any of the fuel cell, the first cooling heat-exchanger and the cooling-water pump, and increases the temperature of the cooling-water supplied into the water tank to a temperature at which the number of bacteria in the water tank does not increase, at predetermined timing.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a fuel cell power generation system and a control method for the fuel cell power generation system.

As a fuel cell power generation system, a system in which hydrocarbons are used as a raw material to generate hydrogen-containing gas by a reforming reaction and supplied to a fuel cell, and a system in which pure hydrogen gas is used as a raw material and supplied to a fuel cell are known. These fuel cell power generation systems generally have a water treatment system. This water treatment system is filled with a water tank that stores condensed water obtained by cooling and condensing the gas flowing inside the fuel cell power generation system, an ion exchange resin that purifies the water stored in the water tank, and the like. It is equipped with a water purification device. The water purified by this water purification device is circulated as battery cooling water for cooling the heat generated in the fuel cell body, and in a reformed power generation system, the reformed water required for the hydrogen generation reaction is supplied. To do.

In addition, bacteria grow inside the water treatment system, and organic substances called slime and biofilm are generated to block the path of the water treatment system. Therefore, in order to suppress the growth of bacteria, a method of raising the temperature of water supplied to the purification device is known. However, there is a risk that bacteria will grow in the water tank that stores the cooling water discharged from the fuel cell.

Japanese Unexamined Patent Publication No. 2010-1138885 JP-A-2010-170877

An object to be solved by the present invention is to provide a fuel cell power generation system and a control method for a fuel cell power generation system capable of suppressing the growth of bacteria in a water tank that stores cooling water discharged from a fuel cell.

The fuel cell power generation system according to the present embodiment includes a fuel cell, a water tank, a first cooling heat exchanger, and a controller. The water tank stores cooling water. The first cooling heat exchanger is arranged between the fuel cell and the water tank at a position on the downstream side of the fuel cell in the cooling water channel for circulating the cooling water and on the upstream side of the water tank. To cool. The controller controls at least one of the fuel cell, the first cooling heat exchanger, and the cooling water pump, and determines the temperature of the cooling water supplied to the water tank to a temperature at which the number of bacteria in the water tank does not increase. Raise at the timing of.

According to this embodiment, it is possible to suppress the growth of bacteria in the water tank that stores the cooling water discharged from the fuel cell.

The figure which shows the structural example of the fuel cell power generation system which concerns on 1st Embodiment. The flowchart which shows the processing example of the fungus growth suppression. The flowchart which shows another processing example of the fungus growth suppression. The figure which shows the structural example of the fuel cell power generation system which concerns on 2nd Embodiment.

Hereinafter, the fuel cell power generation system and the control method of the fuel cell power generation system according to the embodiment of the present invention will be described in detail with reference to the drawings. The embodiments shown below are examples of the embodiments of the present invention, and the present invention is not construed as being limited to these embodiments. Further, in the drawings referred to in the present embodiment, the same parts or parts having similar functions are designated by the same reference numerals or similar reference numerals, and the repeated description thereof may be omitted. In addition, the dimensional ratio of the drawing may differ from the actual ratio for convenience of explanation, or a part of the configuration may be omitted from the drawing.
Purified water channel (first embodiment)

FIG. 1 is a diagram showing a configuration example of the fuel cell power generation system 1 according to the present embodiment. The fuel cell power generation system 1 is a system capable of suppressing the growth of bacteria generated in the water tank 25 and the water purification device 40. The fuel cell power generation system 1 includes a fuel cell 10, heat exchangers 20, 50, a water tank 25, a cooling water pump 30, a water purification device 40, a water treatment pump 60, and a fuel reformer 70. , The reforming processing pump 80, the condenser 90, and the controller 100 are provided.

FIG. 1 further illustrates a cooling water channel L1 and a water purification water channel L2. The cooling water channel L1 is connected to the treated water tank 25a of the water tank 25, and returns to the treated water tank 25a via the fuel cell 10 and the heat exchanger 20. The water purification water channel L2 is connected to the pre-treatment water tank 25b of the water tank 25, and is connected to the post-treatment water tank 25a via the heat exchanger 50 and the water purification device 40.

The fuel cell 10 is connected to the fuel reformer 70 via a pipe, and a cooling water channel L1 is formed therein. The fuel cell 10 includes an anode and a cathode provided so as to sandwich an electrolyte membrane. Further, a fuel flow path is formed in the anode, and hydrogen-containing gas is supplied from the fuel reformer 70. An oxidant flow path is formed in the cathode, and an oxygen-containing gas is supplied from an air blower (not shown).

The fuel cell 10 generates electricity by using the hydrogen-containing gas supplied to the anode and the oxygen-containing gas supplied to the cathode. The heat generated by this power generation is cooled by the cooling water flowing through the cooling water channel L1 in the fuel cell 10. Further, in the fuel cell 10, the amount of power generation increases and the amount of heat generated also increases as the amount of hydrogen-containing gas supplied increases. Therefore, as the amount of power generation increases, the amount of heat supplied from the fuel cell 10 to the cooling water flowing through the drainage channel L1 per unit time also increases.

The heat exchanger 20 is located on the downstream side of the fuel cell 10 of the cooling water channel L1 for circulating cooling water between the fuel cell 10 and the water tank 25, and is arranged on the upstream side of the water tank 25 to cool the cooling water. .. More specifically, the heat exchanger 20 is provided with a high temperature water channel on the high temperature side for receiving the cooling water, and this high temperature water channel is connected to the fuel cell 10 and the water tank 25 to form the cooling water channel L1. Further, the heat exchanger 20 is provided with a low temperature water channel for circulating low temperature water.

In the heat exchanger 20, the cooling water in the cooling water channel L1 is cooled by heat exchange between the cooling water flowing through the high temperature water channel and the circulating water flowing through the low temperature water channel. That is, in this heat exchanger 20, the temperature of the cooling water discharged from the heat exchanger 20 can be made higher by reducing the flow rate of the fluid flowing on the low temperature side of the heat exchanger 20. Further, in this heat exchanger 20, even if the flow rate of the fluid flowing on the low temperature side of the heat exchanger 20 is constant, it is discharged from the heat exchanger 20 by increasing the amount of the cooling water flowing in the cooling water channel L1. It is possible to raise the temperature of the cooling water to be made higher. The heat exchanger 20 according to the present embodiment corresponds to the first cooling heat exchanger.

The water tank 25 has a post-treatment water tank 25a and a pre-treatment water tank 25b. The treated water tank 25a is connected to the cooling water channel L1 as described above. Further, it is connected to the fuel reformer 70 via a pipe to supply cooling water as reforming water. As described above, the water purification water channel L2 is connected to the treated water tank 25a. Further, a condenser 90 is connected to the treated water tank 25a via a pipe, and condensed water 1 obtained by cooling the reformed gas of the fuel reformer 70 is introduced. Furthermore, condensed water 2 obtained by cooling the burner exhaust gas of the fuel reformer 70, the cathode exhaust of the fuel cell 10, and the anode exhaust of the fuel cell 10 is introduced into the treated water tank 25a.

The cooling water pump 30 circulates the cooling water in the cooling water channel L1. As mentioned above
By increasing the amount of cooling water flowing in the cooling water channel L1, it is possible to raise the temperature of the cooling water discharged from the heat exchanger 20 to a higher temperature. Therefore, by increasing the amount of water sent out by the cooling water pump 30, the temperature of the cooling water sent to the water tank 25a after the treatment of the water tank 25 can be raised.

The water purification device 40 purifies the water in the pretreatment water tank 25b. The water purification device 40 has, for example, a water treatment filter housed in a cylindrical container and an ion exchange resin. As a result, after impurities such as cations and anions are removed, the cooling water is supplied to the treated water tank 25a. The temperature of the water sent to the water purification device 40 is lower than the heat resistant temperature of the ion exchange resin used in the water purification device 40, and a lower temperature is required. ing.

The heat exchanger 50 is arranged on the downstream side of the pretreatment water tank 25b of the water purification water channel L2 and on the upstream side of the water purification device 40 to cool the cooling water in the purification water channel L2. More specifically, the heat exchanger 50 is provided with a high-temperature water channel on the high-temperature side that receives cooling water, and this high-temperature water channel is connected to the water purification device 40 and the pretreatment water tank 25b, and is connected to the water purification water channel L2. To configure. Further, the heat exchanger 50 is provided with a low temperature water channel for circulating low temperature water.

In the heat exchanger 50, the cooling water in the purified water channel L2 is cooled by heat exchange between the cooling water flowing through the high temperature water channel and the circulating water flowing through the low temperature water channel. That is, in this heat exchanger 50, it is possible to raise the temperature of the cooling water discharged from the heat exchanger 50 to a higher temperature by reducing the flow rate of the fluid flowing on the low temperature side of the heat exchanger 50. Further, in this heat exchanger 50, even if the flow rate of the fluid flowing on the low temperature side of the heat exchanger 50 is constant, it is discharged from the heat exchanger 50 by increasing the amount of cooling water flowing in the purified water channel L2. It is possible to raise the temperature of the cooling water to be heated. The heat exchanger 50 according to this embodiment corresponds to the second cooling heat exchanger.

The cooling water pump 60 circulates the cooling water in the purified water channel L2. As mentioned above
By increasing the amount of cooling water flowing in the cooling water channel L2, it is possible to raise the temperature of the cooling water discharged from the heat exchanger 50 to a higher temperature. Therefore, by increasing the amount of water delivered by the cooling water pump 60, the temperature of the cooling water sent to the water purification device 40 can be raised.

The fuel reformer 70 reforms a hydrocarbon-based raw fuel to generate a hydrogen-containing gas, which is supplied to the fuel cell 10. The fuel reformer 70 is connected to an external fuel source and is further fitted with a reformer burner. As described above, the reformed water supplied from the treated water tank 25a is converted into steam, and a hydrogen-containing gas is generated by a reforming reaction with a hydrocarbon-based raw material and fuel. The reforming pump 80 supplies the cooling water in the treated water tank 25a to the fuel reforming device 70 as reforming water.

The condenser 90 removes water from the element-containing gas produced by the fuel reformer 70. By increasing the amount of heat of the condensed water supplied from the condenser 90 to the pretreatment water tank 25b, it is possible to raise the water temperature of the pretreatment water tank 25b. That is, by increasing the hydrocarbon-based raw fuel supplied to the fuel reformer 70, it is possible to increase the amount of heat of the condensed water supplied from the condenser 90 to the pretreatment water tank 25b.

The controller 100 is a device that controls the entire fuel cell power generation system 1, and has, for example, a CPU (Central Processing Unit) and a storage unit. The controller 100 realizes each function by executing a program stored in the storage unit. The controller 100 acquires the temperature information of each of the post-treatment water tank 25a, the pre-treatment water tank 25b, and the water purification device 40 from a thermometer (not shown).

Next, a control example by the controller 100 of the fuel cell power generation system 1 will be described.

First, the hydrocarbon fuel is supplied to the fuel reformer 70. The supplied raw material fuel is desulfurized by the fuel reformer 70, and the hydrogen-containing gas gas generated by the reforming reaction is supplied to the anode of the fuel cell 10. At this time, the condensed water 1 obtained by cooling the reformed gas of the fuel reformer 70 by the condenser 90 is sent to the pretreatment water tank 25b.

Oxygen-containing gas is supplied to the cathode of the fuel reformer 70, and the fuel cell 10 generates electricity. The hydrogen-containing anode exhaust gas that has not been consumed by the fuel cell 10 is cooled and supplied to the pretreatment water tank 25b as condensed water 2. Similarly, the cathode exhaust gas 7 containing oxygen that has not been consumed by the fuel cell 10 is cooled and supplied to the pretreatment water tank 25b as condensed water 2. Further, the combustion exhaust gas of the burner of the fuel reformer 70 is cooled and supplied as condensed water 2 to the pretreatment water tank 25b. In this way, the reformed gas condensed water, the anode exhaust gas condensed water, the reformer combustion exhaust gas condensed water, and the cathode exhaust gas condensed water are stored in the pretreatment water tank 25b.

The cooling water (condensed water) of the pretreatment water tank 25b is sent out by the cooling water pump 60, and after the temperature is reduced by the heat exchanger 50, it is supplied to the water purification device 40. The cooling water supplied to the water purification device 40 is supplied to the treated water tank 25a after impurities are removed.

The cooling water of the treated water tank 25a is sent to the cooling water channel L1 of the fuel cell 10 by the cooling water pump 30. The cooling water cools the fuel cell 10 and maintains the fuel cell 10 at an optimum operating temperature. At this time, the cooling water is heated by the fuel cell 10 and rises to, for example, about 60 ° C. to 65 ° C. The cooling water that has passed through the fuel cell 10 exchanges heat with the circulating water in the low temperature water channel by the heat exchanger 20, and the temperature drops to a degree slightly lower than about 60 ° C. The cooling water whose temperature has dropped to a little lower than about 60 ° C. is stored again in the treated water tank 25a.

Next, an example of treatment for suppressing bacterial growth will be described with reference to FIGS. FIG. 2 is a flowchart of a treatment example of bacterial growth suppression.

The temperature of the cooling water supplied to the treated water tank 25a is monitored by the controller 100 by a thermometer. During the power generation operation of the fuel cell 10, when a certain period of time elapses while the temperature of the cooling water remains below the bacterial growth limit temperature, the controller 100 starts high temperature treatment of the cooling water (step S100).

The controller 100 reduces the delivery amount of the low temperature water channel in the heat exchanger 20 (step S102). As a result, the amount of heat exchanged from the cooling water to the low-temperature water channel decreases relative to the amount of heat possessed by the cooling water, and the temperature of the condensed water supplied to the treated water tank 25a rises. At this time, the controller 100 adjusts the delivery amount of the low temperature water channel so that the temperature of the condensed water becomes equal to or higher than the bacterial growth suppression temperature, and keeps the temperature kept above the bacterial growth suppression temperature for a certain period of time. By setting the cooling water passing through the heat exchanger 20 to a predetermined temperature in this way, the bacterial growth suppression treatment of the post-treatment water tank 25a can be performed.

Further, at this time, the bacterial growth suppression treatment of the water purification device 40 may be performed together or independently. In this case, in step S102, the temperature of the water purification device 40 is monitored by the controller 100 by the thermometer. The controller 100 reduces the delivery amount of the cold water channel in the heat exchanger 50. As a result, the amount of heat exchanged from the cooling water to the low-temperature water channel decreases relative to the amount of heat contained in the cooling water, and the temperature of the cooling water supplied to the water purification device 40 also rises. In this way, by setting both the cooling water passing through the water purification device 40 and the cooling water passing through the heat exchanger 20 to a predetermined temperature, the bacterial growth suppression treatment of the post-treatment water tank 25a can be efficiently performed. At this time, the bacterial growth suppression treatment of the water purification device 40 is also performed.

FIG. 3 is a flowchart of another treatment example of bacterial growth suppression.

The temperature of the cooling water supplied to the treated water tank 25a is monitored by the controller 100 by a thermometer. During the power generation operation of the fuel cell 10, when a certain period of time elapses while the temperature of the cooling water remains below the bacterial growth limit temperature, the controller 100 starts high temperature treatment of the cooling water (step S200).

The controller 100 increases the delivery amount in the cooling water pump 30 (step S202). As a result, the amount of heat exchanged from the cooling water to the low-temperature water channel decreases relative to the amount of heat possessed by the cooling water, and the temperature of the cooling water supplied to the treated water tank 25a rises. At this time, the temperature of the cooling water is adjusted so that the temperature of the cooling water is equal to or higher than the temperature for suppressing bacterial growth, and the amount of the cooling water pump 30 is maintained at the temperature higher than the temperature for suppressing bacterial growth for a certain period of time.

Further, at this time, the bacterial growth suppression treatment of the water purification device 40 may be performed together or independently. In this case, in step S102, the temperature of the water purification device 40 is monitored by the controller 100 by the thermometer. The controller 100 increases the delivery amount in the water treatment pump 60 (step S202). As a result, the amount of heat exchanged from the cooling water to the low-temperature water channel decreases relative to the amount of heat possessed by the cooling water, and the temperature of the cooling water supplied to the water purification device 40 rises. At this time, the controller 100 adjusts the delivery amount of the cooling water pump 30 and the water treatment pump 60 so that the temperature of the cooling water becomes equal to or higher than the bacterial growth suppression temperature, and keeps the cooling water at the bacterial growth suppression temperature or higher for a certain period of time. In this way, by setting both the cooling water passing through the water purification device 40 and the cooling water passing through the heat exchanger 20 to a predetermined temperature, the bacterial growth suppression treatment of the post-treatment water tank 25a can be efficiently performed. At this time, the bacterial growth suppression treatment of the water purification device 40 is also performed.

Further, the process shown in FIG. 3 may be performed in parallel with the process of FIG. As a result, both the cooling water passing through the water purification device 40 and the cooling water passing through the heat exchanger 20 can be cooled at a predetermined temperature in a short time, and the post-treatment water tank 25a can be further treated to suppress bacterial growth. It can be done efficiently.

Further, the controller 100 can raise the post-treatment water tank 25a and the pre-treatment water tank 25b by increasing the power generation output of the fuel cell 10. That is, by increasing the power generation output of the fuel cell 10, the temperature of the cooling water discharged from the fuel cell 10 rises, and the amount of heat exchange from the cooling water to the low temperature water channel is relative to the amount of heat possessed by the cooling water. The temperature of the cooling water supplied to the water tank 25a after the treatment rises.

Further, by increasing the power generation output of the fuel cell 10, the high-temperature condensed waters 1 and 2 increase, and the water temperature of the pretreatment water tank 25b rises. That is, by increasing the hydrocarbon-based raw fuel supplied to the fuel reformer 70, it is possible to increase the amount of heat of the condensed water 1 supplied from the condenser 90 to the pretreatment water tank 25b. Similarly, the condensed water 2 of the combustion exhaust gas of the burner of the fuel reformer 70 also increases.

Further, by increasing the power generation output of the fuel cell 10, the condensed water 2 of the anode exhaust gas containing hydrogen not consumed by the fuel cell 10 and the cathode exhaust gas containing oxygen not consumed by the fuel cell 10 are condensed. Water 2 also increases, raising the water temperature of the pretreatment water tank 25b.

These processes may be performed in parallel with the processes shown in FIGS. 2 and 3. As a result, the bacterial growth suppression treatment of the post-treatment water tank 25a and the water purification device 40 can be performed more efficiently.

As described above, according to the present embodiment, the controller 100 controls at least one of the fuel cell 10, the heat exchanger 20, and the cooling water pump 30, and the water tank 25 is set to a temperature at which the number of bacteria does not increase. It was decided to raise the temperature of the supplied cooling water at a predetermined timing. By raising the temperature of the cooling water supplied to the water tank 25, it is possible to reduce the number of bacteria in the water tank 25.

(Second Embodiment)
The fuel cell power generation system 1 according to the second embodiment supplies pure hydrogen gas as a raw fuel to the fuel cell, and the water tank 25 is composed of one space. Is different from. Hereinafter, the differences from the fuel cell power generation system 1 according to the first embodiment will be described.

FIG. 4 is a diagram showing a configuration example of the fuel cell power generation system 1 according to the second embodiment. Pure hydrogen is supplied to the fuel cell 10 of the fuel cell power generation system 1 according to the second embodiment. Therefore, the fuel reformer 70 (FIG. 1) is not provided.

Further, the water tank 25 is composed of one space. Since it is not necessary to send the reformed water to the fuel reformer 70 (FIG. 1) in the present embodiment, the purity of the water can be made lower than that of the treated water tank 25a of the first embodiment. Therefore, the water tank 25 can have a simpler configuration. On the other hand, since the condensed water, the water in the cooling water channel L1 and the water in the water purification water channel L2 are all temporarily collected in the same container, the condensed water is required to raise the temperature in the water tank 25. , It is necessary to adjust the temperature of the water in the cooling water channel L1 and the water in the water purification water channel L2. Therefore, the controller 100 simultaneously adjusts the temperature of the water in the cooling water channel L1 and the water in the water purification water channel L2. By raising the temperature of the water in the cooling water channel L1 to a higher temperature, it is possible to raise the temperature in the water tank 25 to a higher temperature without adjusting the temperature of the water in the water purification water channel L2.

As described above, according to the present embodiment, pure hydrogen is supplied to the fuel cell 10 and the water tank 25 is configured in one space. Therefore, the controller 100 is determined to simultaneously adjust the temperature of the water in the cooling water channel L1 and the water in the water purification water channel L2.
In this way, by setting both the cooling water passing through the water purification device 40 and the cooling water passing through the heat exchanger 20 to a predetermined temperature, the bacterial growth suppression treatment of the water tank 25 can be performed more efficiently. It will be possible.

Although some embodiments have been described above, these embodiments are presented only as examples and are not intended to limit the scope of the invention. The novel devices, methods and programs described herein can be implemented in a variety of other forms. In addition, various omissions, substitutions, and changes can be made to the forms of the apparatus, method, and program described in the present specification without departing from the gist of the invention.

1: Fuel cell power generation system, 10: Fuel cell, 20, 50: Heat exchanger, 25: Water tank, 25a: Water tank after treatment, 25b: Water tank before treatment, 30: Cooling water pump, 40: Water purification device , 60: Water treatment pump, 70: Fuel reformer, 90: Condenser, 100: Controller, L1: Cooling water channel, L2: Water purification water channel.

Claims (12)

With a fuel cell
A water tank that stores cooling water and
The cooling water is cooled by being arranged between the fuel cell and the water tank at a position on the downstream side of the fuel cell and the upstream side of the water tank in the cooling water channel for circulating the cooling water. The first cooling heat exchanger and
A cooling water pump that circulates the cooling water in the cooling water channel,
The temperature of the cooling water that controls at least one of the fuel cell, the first cooling heat exchanger, and the cooling water pump and is supplied to the water tank to a temperature at which the number of bacteria in the water tank does not increase. With a controller that raises the temperature at a predetermined timing,
A fuel cell power generation system equipped with. A water purification device for purifying the water in the water tank,
A second that is located on the downstream side of the water tank of the water purification water channel that circulates the cooling water between the water purification device and the water tank, and is arranged on the upstream side of the water purification device to cool the cooling water. Cooling heat exchanger and
A water treatment pump for circulating the cooling water in the water purification channel is further provided.
The controller controls at least one of the second cooling heat exchanger and the water treatment pump, and raises the temperature of water sent to the water purification device to a temperature at which the number of bacteria does not increase at a predetermined timing. , The fuel cell power generation system according to claim 1. The fuel cell power generation system according to claim 1 or 2, wherein the controller raises the water temperature of the water tank by increasing the power generation output of the fuel cell. A fuel reformer that reforms hydrocarbon-based raw fuel to generate hydrogen-containing gas and supplies it to the fuel cell is further provided.
The fuel cell power generation system according to any one of claims 1 to 3, wherein the controller raises the water temperature of the water tank by adjusting the reforming amount of the raw material fuel in the fuel reformer. Further provided with a condenser for removing water from the element-containing gas generated by the fuel reformer.
The fuel cell power generation system according to claim 4, wherein the water temperature of the water tank is raised by increasing the amount of heat of the condensed water supplied from the condenser to the water tank. The fuel according to any one of claims 1 to 5, wherein the controller raises the water temperature of the water tank by reducing the flow rate of the fluid flowing on the low temperature side of the first cooling heat exchanger. Battery power generation system. The fuel cell power generation system according to any one of claims 1 to 6, wherein the controller raises the temperature of the cooling water sent to the water tank by increasing the amount of water delivered by the cooling water pump. .. The fuel cell power generation system according to claim 2, wherein the controller raises the temperature of water sent to the water purification device by reducing the flow rate of the fluid flowing on the low temperature side of the second cooling heat exchanger. .. The fuel cell power generation system according to claim 2 or 8, wherein the controller raises the temperature of water sent to the water purification device by increasing the amount of water delivered by the water treatment pump. The fourth aspect of claim 4, wherein the water tank is introduced with condensed water obtained by cooling at least one or more of the burner exhaust gas of the fuel reformer and the cathode exhaust and the anode exhaust of the fuel cell. Fuel cell power generation system. The water tank has a first tank for storing water for delivering the cooling water and a second tank for storing condensed water.
The cooling water channel connected to the first tank returns to the first tank via the fuel cell and the first cooling heat exchanger, and the water purification water channel connected to the second tank The fuel cell power generation system according to claim 2, which is connected to the first tank via the second cooling heat exchanger and the water purification device. With a fuel cell
A water tank that stores cooling water and
A first cooling heat that is located on the downstream side of the fuel cell in the cooling water channel that circulates the cooling water between the fuel cell and the water tank and is arranged on the upstream side of the water tank to cool the cooling water. With the exchanger
A cooling water pump that circulates the cooling water in the cooling water channel,
It is a control method of a fuel cell power generation system equipped with
Control at least one of the fuel cell, the first cooling heat exchanger, and the cooling water pump, and adjust the temperature of the cooling water supplied to the water tank to a temperature at which the number of bacteria does not increase at a predetermined timing. How to control the fuel cell power generation system to raise.

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