JP6946833B2 - Fuel cell system - Google Patents

Description

The present invention relates to a fuel cell system.

Conventionally, as this type of fuel cell system, a water storage device (reformed water tank) for accommodating reformed water used for generating reformed gas and water vapor contained in the reformed gas circulated in the fuel cell are condensed. A condenser (condensing part) that supplies to the water storage device, a water supply pipe that connects the high-pressure water supply source (water pipe) and the water storage device, a water supply valve that opens and closes the water supply pipe, and a water purifier provided in the water supply pipe. , Are proposed (see, for example, Patent Document 1). In this fuel cell system, when a new system is installed, the water supply valve is opened and the water from the high-pressure water supply source is supplied to the water reservoir via the water purifier to automatically fill the water reservoir. Can be done.

Japanese Unexamined Patent Publication No. 2016-177998

In the fuel cell system described above, the water storage device (modified water tank) can be automatically filled with water as needed, but the water supply pipe and water supply pipe for connecting the high-pressure water supply source and the water storage device are opened and closed. A water supply valve for this purpose and a water purifier for purifying tap water are required, which complicates the system and increases the size, resulting in an increase in cost.

The main object of the fuel cell system of the present invention is to enable water to be supplied to the reformed water tank by a simple configuration.

The fuel cell system of the present invention has adopted the following means in order to achieve the above-mentioned main object.

The fuel cell system of the present invention
A fuel cell system including a fuel cell capable of generating electricity based on a reforming gas and an oxidant gas.
A reforming unit that reforms the raw fuel gas into the reformed gas using reformed water and supplies it to the fuel cell.
A raw fuel gas supply device that supplies the raw material gas to the reforming unit,
A reforming water supply device having a reforming water tank for storing the reforming water and supplying the reforming water in the reforming water tank to the reforming unit.
A combustion unit that burns the reformed gas that has passed through the fuel cell,
A condensing part that cools and condenses the combustion exhaust gas generated by the combustion of the reformed gas,
A condensed water flow path that supplies the condensed water generated by cooling the combustion exhaust gas to the reformed water tank, and
A water purifier provided in the condensed water flow path and
A water supply channel connected to a water supply port formed in the housing and capable of supplying water from the water supply port to the upstream of the water purifier in the condensed water flow path.
The gist is to prepare.

In the fuel cell system of the present invention, the condensed water generated by cooling the combustion exhaust gas in the condensing portion is supplied to the reformed water tank via the condensed water flow path provided with the water purifier. It is provided with a water supply channel capable of supplying water upstream of the water purifier in the condensed water flow path from the water supply port formed in. By supplying water from the water supply port to the upstream of the water purifier in the condensed water flow path via the water supply channel, the water purified by the water purifier can be supplied to the reformed water tank. In this way, the system can be made simpler by sharing at least a part of the water supply line for supplying water to the reformed water tank with the condensed water flow path (water purifier). In addition, since water can be supplied to the reforming water tank from the water supply port formed in the housing, the water supply work is easier than in the case where the panel of the housing is removed and water is directly supplied to the reforming water tank. can do.

In such a fuel cell system of the present invention, an exhaust gas flow path for discharging the gas component of the combustion exhaust gas cooled in the condensing portion to the outside is provided, and the water supply channel is shared with the exhaust gas flow path. May be. In this way, the system can be made even simpler because a dedicated water supply channel is not required.

Further, in the fuel cell system of the present invention, the water supply port may be an exhaust port of the exhaust gas flow path and may be formed on the upper surface of the housing. In this way, water can be supplied from the exhaust port formed on the upper surface of the housing, and the water supply work can be made easier.

Further, in the fuel cell system of the present invention, a buffer tank may be provided between the condensing unit and the water purifier. In this way, even if an amount of water exceeding the processing capacity of the water purifier is supplied to the condensed water flow path, the water accumulated upstream of the water purifier can be temporarily stored, so that the accumulated water can be used. It is possible to prevent the exhaust gas flow path and the heat exchanger from being blocked. This makes it possible to start the system when the minimum amount of water required to operate the fuel cell system is supplied to the reformed water tank even during the water supply work, so that the system can be operated at an early stage. Can be done.

Further, in the fuel cell system of the present invention, a water level sensor for detecting the water level of the reforming water tank is provided, and the water level of the reforming water tank supplies the reforming water to the reforming unit by the reforming water supply device. One of the start-up conditions may be that it is detected that the water level has reached a possible predetermined water level, and the system may be started up when the start-up condition is satisfied. In this way, it is possible to start the system at an early stage without waiting for the water supply work to the reformed water tank to be completed.

Further, in the fuel cell system of the present invention, a bottle for supplying water to the water supply port of the water supply channel may be provided, and the bottle may have an orifice for adjusting the amount of water supplied. In this way, an appropriate amount of water can be supplied according to the processing capacity of the water purifier, and the buffer tank can be omitted or the capacity of the buffer tank can be reduced.

It is a block diagram which shows the outline of the structure of the fuel cell system 10 of this embodiment. It is explanatory drawing which shows the state of the water supply work to the reforming water tank 57. It is a block diagram which shows the outline of the structure of the fuel cell system 110 of a modification. It is a block diagram which shows the outline of the structure of the fuel cell system 210 of the modification. It is a block diagram which shows the outline of the structure of the fuel cell system 310 of a modification.

FIG. 1 is a configuration diagram showing an outline of the configuration of the fuel cell system 10 of the present embodiment. As shown in FIG. 1, the fuel cell system 10 of the present embodiment includes a power generation unit 20 having a fuel cell stack 36 that generates power by being supplied with a fuel gas containing hydrogen and an oxidizing agent gas (air) containing oxygen. The hot water supply unit 100 has a hot water storage tank 101 that recovers and supplies hot water generated by the power generation of the power generation unit 20, and a control device 70 that controls the entire system.

In addition to the fuel cell stack 36, the power generation unit 20 evaporates reformed water to generate water vapor, and also produces hydrogen from the vaporizer 32 that preheats the raw material fuel gas (for example, natural gas or LP gas), and the raw material fuel gas and water vapor. Air is supplied to the power generation module 30 including the reformer 33 for generating the included fuel gas (reform gas), the raw fuel gas supply device 40 for supplying the raw fuel gas to the vaporizer 32, and the fuel cell stack 36. An air supply device 50, a reformed water supply device 55 that supplies the reformed water in the reformed water tank 57 to the vaporizer 32, and an exhaust heat recovery device 60 that recovers the exhaust heat generated by the power generation module 30. Be prepared.

The reformer 33 is configured by supporting a reforming catalyst (for example, a Ru or Ni-based catalyst) on a carrier such as ceramic, and steam reforms a mixed gas of raw fuel gas and steam supplied from the vaporizer 32. It reforms into fuel gas (reforming gas) by a quality reaction.

The power generation module 30 (vaporizer 32, reformer 33 and fuel cell stack 36) is housed in a box-shaped module case 31 formed of a heat insulating material. The module case 31 is provided with a combustion unit 34 for starting the fuel cell stack 36, generating steam in the vaporizer 32, and supplying heat required for the steam reforming reaction in the reformer 33. Fuel off gas (anode off gas) and oxidant off gas (cathode off gas) that have passed through the fuel cell stack 36 are supplied to the combustion unit 34, and the mixed gas is ignited by the ignition heater 35 and burned to burn the fuel cell. The stack 36, the vaporizer 32, and the reformer 33 are heated. The combustion exhaust gas generated by the combustion of the fuel off gas and the oxidant off gas is supplied to the heat exchanger 62 via the combustion catalyst 37. The combustion catalyst 37 is an oxidation catalyst that reburns the fuel gas left unburned in the combustion unit 34 by the catalyst.

The exhaust heat recovery device 60 has a circulation pipe 61 that connects the heat exchanger 62 and the hot water storage tank 101 that stores the hot water storage water to form a circulation path for the hot water storage water. A circulation pump 63 is provided in the circulation pipe 61. By circulating the hot water stored by the circulation pump 63, the hot water is heated and heated by heat exchange with the combustion exhaust gas in the heat exchanger 62. The hot water is stored in the hot water storage tank 101. The heat exchanger 62 is connected to the reforming water tank 57 via the condensed water supply pipe 65 and is connected to the outside air via the exhaust gas discharge pipe 67. The combustion exhaust gas supplied to the heat exchanger 62 is cooled by heat exchange with the hot water, and the water vapor component is condensed and collected in the reformed water tank 57 via the condensed water supply pipe 65. Further, the remaining exhaust gas is discharged to the outside air through the exhaust gas discharge pipe 67.

A water purifier 66 is provided in the condensed water supply pipe 65. In the water purifier 66, an ion exchange resin is filled in a storage container in which an inflow port for flowing condensed water is formed at the upper part and an outlet for discharging condensed water is formed at the lower part. Purified water by removing impurities contained in the flowing water. A buffer tank 64 is provided between the heat exchanger 62 and the water purifier 66. The reason why the buffer tank 64 is provided will be described later.

One end side of the exhaust gas discharge pipe 67 is connected to the exhaust gas outlet of the heat exchanger 62, and the other end side extends upward and is connected to the exhaust port 67o formed on the upper surface of the housing 22. The gas component of the combustion exhaust gas discharged from the exhaust port 67o is discharged to the outside from the exhaust port 67o. A cap (not shown) having an opening in the radial direction is detachably attached to the exhaust port 67o, and the exhaust gas can be discharged to the outside through the opening of the cap with the cap attached.

The raw fuel gas supply device 40 has a raw fuel gas supply pipe 41 that connects the gas supply source 1 and the vaporizer 32. The raw material fuel gas supply pipe 41 is provided with a raw material fuel gas supply valve 42, a raw material fuel gas pump 43, a desulfurizer 44, and the like in order from the gas supply source 1 side, and the raw material fuel gas supply valve 42 is opened. By driving the raw material fuel gas pump 43, the raw material fuel gas from the gas supply source 1 is passed through the desulfurizer 44 and supplied to the vaporizer 32. The raw material fuel gas supplied to the vaporizer 32 is supplied to the reformer 33 via the vaporizer 32 and reformed into a fuel gas. The desulfurization device 44 removes the sulfur content contained in the raw material fuel gas, and for example, a room temperature desulfurization method for removing the sulfur compound by adsorbing it on an adsorbent such as zeolite can be adopted.

The air supply device 50 has an air supply pipe 51 that connects the filter 52 that communicates with the outside air and the fuel cell stack 36. The air supply pipe 51 is provided with an air blower 53, and by driving the air blower 53, air sucked through the filter 52 is supplied to the fuel cell stack 36.

The reformed water supply device 55 has a reformed water supply pipe 56 that connects the reformed water tank 57 for storing the reformed water and the vaporizer 32. The reforming water supply pipe 56 is provided with a reforming water pump 58, and by driving the reforming pump 58, the reformed water in the reforming water tank 57 is supplied to the vaporizer 32. The reformed water supplied to the vaporizer 32 is converted into steam by the vaporizer 32 and used for the steam reforming reaction in the reformer 33. The reforming water tank 57 is provided with a water level sensor 59 for detecting the water level of the stored reforming water. In the embodiment, the water level sensor 59 is configured as a float type water level sensor, and the water level W of the reforming water tank 57 is a predetermined low water level slightly higher than the lower limit water level at which the reforming water can be pumped by the reforming water pump 58. A low water level detection sensor that turns on when the water level is Wl or higher, a high water level detection sensor that turns on when the water level W of the reforming water tank 57 is higher than the low water level Wl and lower than the full water level, and a predetermined high water level Wh or higher. including.

The fuel cell stack 36 includes a solid oxide fuel cell having a solid electrolyte composed of an oxygen ion conductor, an anode provided on one surface of the solid electrolyte, and a cathode provided on the other surface of the solid electrolyte. It is configured as a laminated structure, and generates electricity by an electrochemical reaction between hydrogen in the fuel gas supplied to the anode and oxygen in the air supplied to the cathode. A power line from a commercial power source to a load is connected to the output terminal of the fuel cell stack 36 via a power conditioner (not shown), and the DC power from the fuel cell stack 36 is voltage-converted and DC by the power conditioner. After passing through / AC conversion, it is added to the AC power from the commercial power supply and supplied to the load.

The control device 70 is a microprocessor composed of a CPU, ROM, RAM, and the like. The control device 70 inputs a gas flow rate from a flow rate sensor (not shown) provided in the raw material fuel gas supply pipe 41, a detection signal from a water level sensor 59 (low water level detection sensor, high water level detection sensor), and the like. Further, the control device 70 outputs a drive signal to the ignition heater 35, the raw fuel gas supply valve 42, the raw fuel gas pump 43, the air blower 53, the reforming water pump 58, the circulation pump 63, and the like.

The fuel cell system 10 configured in this way is required to start the system in a state where the system start condition such that the water level W of the reforming water tank 57 is low water level Wl or higher (low water level detection sensor is on) is satisfied. Then, the system boot process is executed. In the system start-up process, for example, the corresponding auxiliary machinery is sequentially controlled, the fuel component is adsorbed on the desulfurizer 44 to suppress the air-fuel ratio deviation of the mixed gas, the fuel adsorption process, the purge process of the combustion unit 34, and the combustion unit 34. It is carried out by sequentially executing the off-gas ignition treatment and the steam reforming treatment in.

When the start-up of the system is completed, the fuel cell system 10 executes the power generation process. In the power generation process, the target gas flow rate Qg * is set based on the system required output, and the raw material fuel gas supply control that controls the raw material fuel gas pump 43 so that the raw material fuel gas is supplied according to the set target gas flow rate Qg *, and the target Air supply control that sets the target air flow rate Qa * so that it has a predetermined air fuel ratio with respect to the gas flow rate Q *, and controls the air blower 53 so that air is supplied according to the set target air flow rate Qa *, and system requirements. A reformed water supply control is executed in which a target water amount is set based on the output and the reformed water pump 58 is controlled so that the reformed water is supplied according to the set target water amount.

Further, in the fuel cell system 10, when the water level W of the reforming water tank 57 is detected by the water level sensor 59 as being equal to or higher than the low water level Wl and lower than the high water level Wh during power generation (the low water level detection sensor is on and the high water level detection sensor is activated). When it is off), output limit control is performed to reduce the system request output. As a result, the amount of condensed water generated by the heat exchanger 62 can be increased, and the water level in the reforming water tank 57 can be restored.

Further, when the water level sensor 59 detects that the water level W of the reforming water tank 57 is less than the low water level Wl during power generation (when the low water level detection sensor is off), the fuel cell system 10 operates the system. Stop it.

Here, in the fuel cell system 10, the system is stopped when the reforming water tank 57 is empty, such as when newly installed, or when the water level of the reforming water tank 57 is insufficient (water level W is less than low water level Wl). In that case, water supply work (water filling) to the reforming water tank 57 is required to start the system. The water supply operation is basically performed until the high water level sensor is turned on, that is, until the water level W of the reforming water tank 57 becomes the high water level WH or higher. FIG. 2 is an explanatory diagram showing a state of water supply work to the reforming water tank 57. As shown in the figure, an exhaust port 67o of an exhaust gas discharge pipe 67 extending upward is provided on the upper surface of the housing 22, and the exhaust gas discharge pipe 67 passes through a heat exchanger 62 and a condensed water supply pipe 65. It is connected to the reforming tank 57. Therefore, the operator removes the cap attached to the exhaust port 67o and pours the water in the water supply bottle 90 from the spout 91 to the exhaust port 67o to exchange the exhaust gas discharge pipe 67 and heat from the exhaust port 67o. Water can be supplied to the reforming water tank 57 via the vessel 62 and the condensed water supply pipe 65. Since the condensed water supply pipe 65 is provided with a water purifier 66 filled with an ion exchange resin 66i for purifying the condensed water, the water (tap water) injected from the water supply bottle 90 is ion-exchanged. After being purified by the resin 66i, it is supplied to the reforming water tank 57. In the embodiment, the water supply bottle 90 is fixed to the housing 22 by fitting the spout 91 into the exhaust port 67o, and the operator simply sets the water supply bottle 90 in the exhaust port 67o to supply water. Can do the work.

When a water purifier 66 (ion exchange resin 66i) is injected with an amount of water exceeding its processing capacity during the water supply operation, the injected water is accumulated on the upstream side of the water purifier 66. In the embodiment, since the buffer tank 64 is provided between the heat exchanger 62 and the water purifier 66, the water accumulated upstream of the water purifier 66 can be stored in the buffer tank 64. As a result, even if an amount of water exceeding the processing capacity of the water purifier 66 is injected into the condensed water supply pipe 65, the exhaust gas discharge pipe 67 and the heat exchanger 62 are formed by the water accumulated on the upstream side of the water purifier 66. Can be suppressed from being blocked. As described above, when the water level W of the reforming water tank 57 becomes the low water level Wl or higher, the system start condition is satisfied even during the water supply work, and the system can be started. Even if the system is started during the water supply work, the injected water prevents the exhaust gas discharge pipe 67 and the heat exchanger 62 from being blocked, so the combustion exhaust generated when the system is started The gas can be passed through the heat exchanger 62, and the gas component of the combustion exhaust gas can be smoothly discharged through the exhaust gas discharge pipe 67. Here, the buffer tank 64 has a capacity such that the water accumulated upstream of the water purifier 66 during the water supply operation does not block the exhaust gas discharge pipe 67 and the heat exchanger 62, for example, the reforming water tank 57. The capacity required for the water level W to reach the system-startable low water level Wl and the water level W of the reforming water tank 57 are accumulated upstream of the water purifier 66 when the system-startable low water level Wl is reached. It is desirable that the capacity is secured so that water does not block the exhaust gas discharge pipe 67 and the heat exchanger 62.

In the fuel cell system 10 of the embodiment described above, the condensed water supply pipe 65 for supplying the condensed water generated by cooling the combustion exhaust gas in the heat exchanger 62 to the reforming water tank 57 and the condensed water supply pipe 65 An exhaust gas discharge pipe 67 that is connected to the provided water purifier 66 and the exhaust port 67o formed in the housing 22 and can supply water from the exhaust port 67o to the upstream of the water purifier 66 in the condensed water supply pipe 65. And. As a result, by injecting water into the exhaust port 67o, water can be supplied from the exhaust port 67o to the reforming water tank 57 via the exhaust gas discharge pipe 67 and the condensed water supply pipe 65. In this way, by sharing the water supply line for supplying water to the reformed water tank 57 with the condensed water supply pipe 65, the system can be made a simpler configuration. Further, since water can be supplied to the reforming water tank 57 from the exhaust port 67o formed in the housing 22, the water can be supplied directly to the reforming water tank 57 by removing the panel of the housing 22. Water supply work can be facilitated. Moreover, since the water supply channel to the reformed water tank 57 is shared with the exhaust gas discharge pipe 67 for discharging the gas component of the combustion exhaust gas to the outside air, a dedicated water supply channel is not required, and the system is further simplified. It can be configured.

Further, since the fuel cell system 10 of the embodiment includes the buffer tank 64 between the heat exchanger 62 and the water purifier 66, the condensed water supply pipe 65 contains an amount of water exceeding the processing capacity of the water purifier 66. Even if it is injected, the water accumulated upstream of the water purifier 66 can be temporarily stored in the buffer tank 64. As a result, it is possible to prevent the exhaust gas discharge pipe 67 and the heat exchanger 62 from being blocked by the water accumulated upstream of the water purifier 66. Therefore, even during the water supply work, the system can be started when the water level W of the reforming water tank 57 becomes the low water level Wl or higher, and the system can be operated at an early stage.

In the above-described embodiment, water is injected from the exhaust port 67o of the exhaust gas discharge pipe 67 using the water supply bottle 90, but the present invention is not limited to this, and water is injected using a water supply hose or the like. You may. In this case, the exhaust port 67o (water supply port) does not necessarily have to be provided on the upper surface of the housing 22.

In the above-described embodiment, the buffer tank 64 is provided between the heat exchanger 62 and the water purifier 66, but as shown in the fuel cell system 110 of the modified example of FIG. 3, the buffer tank 64 of the embodiment is provided. And, instead of the water purifier 66, a water purifier 166 filled with an ion exchange resin 166i so that a space 166e is formed in the upper part of the storage container 166h may be provided. In the fuel cell system 110 of this modification, the space 166e above the storage container 166h can function as a buffer tank.

In the above-described embodiment, the buffer tank 64 is provided between the heat exchanger 62 and the water purifier 66, but as shown in the fuel cell system 210 of the modified example of FIG. 4, the spout of the water supply bottle 290 is provided. A throttle (orifice) may be provided in 291 to adjust the flow rate of water injected from the water supply bottle 290 into the exhaust port 67o. The water supply bottle 290 of the modified example is provided with an air hole 292 on the bottom surface opposite to the spout 291. In the fuel cell system 210 of this modification, the buffer tank 264 can have a smaller capacity than the buffer tank 64 of the embodiment. Although the fuel cell system 210 of the modified example is provided with the buffer tank 264 having a small capacity, the buffer tank 264 may be omitted.

In the above-described embodiment, water is supplied to the reforming water tank 57 by injecting water from the exhaust port 67o of the exhaust gas discharge pipe 67, but as shown in the fuel cell system 310 of the modified example of FIG. A water supply pipe 367 is provided, one end of which is connected to the condensed water outlet of the heat exchanger 62 (upstream of the buffer tank 64) and the other end of which extends upward and is connected to the water supply port 367i. , Water may be supplied to the reforming water tank 57 via the condensed water supply pipe 65.

The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem will be described. In the embodiment, the fuel cell stack 36 corresponds to the fuel cell, the reformer 33 corresponds to the reforming unit, the raw fuel gas supply device 40 corresponds to the raw fuel gas supply device, and the reforming water supply device 55 The reforming water supply device corresponds to the reforming water tank 57, the combustion section 34 corresponds to the fuel section, the heat exchanger 62 corresponds to the condensing section, and the condensed water supply pipe 65 corresponds to the condensing section. The water purifier 66 corresponds to the water purifier, the exhaust gas discharge pipe 67 corresponds to the water supply channel, and the exhaust port 67o corresponds to the water supply port. Further, the water supply channel 367 also corresponds to the water supply channel, and the water supply port 367i also corresponds to the water supply port. Further, the exhaust gas discharge pipe 67 corresponds to the exhaust gas flow path. Further, the space 166e of the buffer tanks 64 and 264 and the storage container 166h corresponds to the buffer tank. Further, the water level sensor 59 corresponds to the water level sensor. Further, the water supply bottle 290 corresponds to the bottle, and the spout 291 corresponds to the orifice.

Regarding the correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem, the invention described in the column of means for the embodiment to solve the problem is carried out. Since it is an example for specifically explaining the form for solving the problem, the elements of the invention described in the column of means for solving the problem are not limited. That is, the interpretation of the invention described in the column of means for solving the problem should be performed based on the description in the column, and the embodiment is the invention described in the column of means for solving the problem. It is just a concrete example.

Although the embodiments for carrying out the present invention have been described above using the embodiments, the present invention is not limited to these embodiments, and various embodiments are used without departing from the gist of the present invention. Of course, it can be done.

The present invention can be used in the manufacturing industry of fuel cell systems and the like.

1 Gas supply source, 10, 110, 210, 310 Fuel cell system, 20 power generation unit, 22 housings, 30 power generation modules, 31 module cases, 32 vaporizers, 33 reformers, 34 combustion parts, 35 ignition heaters, 36 Fuel cell stack, 37 combustion catalyst, 40 raw fuel gas supply device, 41 raw fuel gas supply pipe, 42 raw fuel gas supply valve, 43 raw fuel gas pump, 44 desulfurizer, 50 air supply device, 51 air supply pipe, 52 filter , 53 air blower, 55 reformed water supply device, 56 reformed water supply pipe, 57 reformed water tank, 58 reformed water pump, 59 water level sensor, 60 exhaust heat recovery device, 61 circulation pipe, 62 heat exchanger, 63 Circulation pump, 64,264 buffer tank, 65 condensate water supply pipe, 66,166 water purifier, 66i, 166i ion exchange resin, 166h storage container, 166e space, 67 exhaust gas discharge pipe, 67o exhaust port, 70 controller, 90,290 water supply bottle, 91,291 spout, 100 hot water supply unit, 101 hot water storage tank, 292 air holes, 367 water supply pipe, 367i water supply port.

Claims (5)

A fuel cell system including a fuel cell capable of generating electricity based on a reforming gas and an oxidant gas.
A reforming unit that reforms the raw fuel gas into the reformed gas using reformed water and supplies it to the fuel cell.
A raw fuel gas supply device that supplies the raw material gas to the reforming unit,
A reforming water supply device having a reforming water tank for storing the reforming water and supplying the reforming water in the reforming water tank to the reforming unit.
A combustion unit that burns the reformed gas that has passed through the fuel cell,
A condensing part that cools and condenses the combustion exhaust gas generated by the combustion of the reformed gas,
A condensed water flow path that supplies the condensed water generated by cooling the combustion exhaust gas to the reformed water tank, and
A water purifier provided in the condensed water flow path and
An exhaust gas flow path that discharges the gas component of the combustion exhaust gas cooled in the condensing portion to the outside,
A water supply channel connected to a water supply port formed in the housing and capable of supplying water from the water supply port to the upstream of the water purifier in the condensed water flow path.
Equipped with a,
The water supply channel is shared with the exhaust gas flow path.
Fuel cell system. The fuel cell system according to claim 1.
The water supply port is an exhaust port of the exhaust gas flow path and is formed on the upper surface of the housing.
Fuel cell system. The fuel cell system according to claim 1 or 2.
A buffer tank is provided between the condensing unit and the water purifier.
Fuel cell system. The fuel cell system according to any one of claims 1 to 3.
A water level sensor for detecting the water level of the reformed water tank is provided.
One of the starting conditions is that the water level of the reforming water tank is detected by the reforming water supply device to reach a predetermined water level at which the reforming water can be supplied to the reforming unit. Start the system when it is established,
Fuel cell system. The fuel cell system according to any one of claims 1 to 4.
A bottle for supplying water to the water supply port of the water supply channel is provided.
The bottle has an orifice that regulates the amount of water supplied.
Fuel cell system.

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