JP2019029323A - Fuel cell system - Google Patents

Abstract

To allow for water supply to a reforming water tank by a simple configuration.SOLUTION: A fuel cell system 10 includes a fuel cell stack 36 capable of generating power based on reforming gas and oxidant gas, a reforming section for reforming raw fuel gas to reforming gas by using reforming water and supplying to the fuel cell, a raw fuel gas supply device 40 for supplying the raw fuel gas to the reforming section, a reforming water supply device 55 having a reforming water tank 57 for storing the reforming water and supplying the reforming water in the reforming water tank to the reforming section, a combustion part 34 for combusting the reforming gas passed through the fuel cell, a condensation part for cooling and condensing the combustion exhaust gas produced by combustion of the reforming gas, a condensate water duct 65 for supplying the condensate, produced by cooling the combustion exhaust gas, to the reforming water tank, a water purifier 66 provided in the condensate water duct, and a water supply channel connected with a water supply port formed in the enclosure, and capable of supplying water from the water supply port to the upstream of the water purifier in the condensate water duct.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel cell system.

  Conventionally, as this type of fuel cell system, a water reservoir (reformed water tank) that stores reformed water used for the generation of reformed gas, and water vapor contained in the reformed gas that has circulated through the fuel cell are condensed. A condenser (condenser) for supplying to the water reservoir, a water supply pipe connecting the high-pressure water supply source (water pipe) and the water reservoir, a water supply valve for opening and closing the water supply pipe, and a water purifier provided in the water supply pipe; Have been proposed (for example, see 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 through the water purifier, so that the automatic water filling to the water reservoir is performed. Can be performed.

JP, 2006-177998, A

  In the fuel cell system described above, water can be automatically filled to a water reservoir (reformed water tank) as necessary, but a water supply pipe and a water supply pipe for connecting a high pressure water supply source and the water reservoir are opened and closed. Therefore, a water supply valve 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 fuel cell system of the present invention is mainly intended to enable water supply to the reforming water tank with a simple configuration.

  The fuel cell system of the present invention employs the following means in order to achieve the main object described above.

The fuel cell system of the present invention comprises:
A fuel cell system including a fuel cell capable of generating electric power based on a reformed gas and an oxidant gas,
A reforming unit that reforms raw fuel gas into reformed gas using reformed water and supplies the reformed gas to the fuel cell;
A raw fuel gas supply device for supplying the raw fuel gas to the reforming unit;
A reforming water supply device that has the reforming water tank for storing the reforming water, and supplies the reforming water in the reforming water tank to the reforming unit;
A combustion section for burning the reformed gas that has passed through the fuel cell;
A condensing part for cooling and condensing the combustion exhaust gas generated by the combustion of the reformed gas;
A condensed water flow path for supplying condensed water generated by cooling the combustion exhaust gas to the reformed water tank;
A water purifier provided in the condensed water flow path;
A water supply path 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 channel;
It is a summary to provide.

  In the fuel cell system of the present invention, the condensate generated by cooling the combustion exhaust gas in the condensing section is supplied to the reformed water tank via the condensate flow path provided with the water purifier. And a water supply channel capable of supplying water to the upstream of the water purifier in the condensed water channel. 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. Thus, 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), the system can be made simpler. In addition, water can be supplied to the reforming water tank from the water supply port formed in the housing, so that the water supply work is easier than when the housing panel is removed and water is supplied directly to the reforming water tank. can do.

  In such a fuel cell system of the present invention, the fuel cell system includes an exhaust gas passage for discharging the gas component of the combustion exhaust gas cooled by the condensing unit to the outside, and the water supply passage is shared with the exhaust gas passage. It is good. In this way, since a dedicated water supply channel is not required, the system can be further simplified.

  In the fuel cell system of the present invention, the water supply port may be an exhaust port of the exhaust gas passage and formed on the upper surface of the casing. If it carries out like this, water can be supplied from the exhaust port formed in the upper surface of a housing | casing, and a water supply operation | work can be made easier.

  Furthermore, 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 capacity of the water purifier is supplied to the condensate flow path, the water accumulated upstream of the water purifier can be temporarily stored. It is possible to prevent the exhaust gas flow path and the heat exchanger from being blocked. As a result, even during the water supply operation, it is possible to start the system at the stage when the water necessary for the operation of the fuel cell system is supplied to the reforming water tank, and to operate the system at an early stage. Can do.

  The fuel cell system according to the present invention further includes a water level sensor that detects a water level of the reforming water tank, and the water level of the reforming water tank supplies the reforming water to the reforming unit by the reforming water supply device. It is also possible to activate the system when the activation condition is satisfied, with one of the activation conditions being detected as having reached a possible predetermined water level. In this way, it is possible to start the system at an early stage without waiting for completion of the water supply operation to the reforming water tank.

  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 a supply amount of water. In this way, it is possible to supply an appropriate amount of water 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 a structure of the fuel cell system 10 of this embodiment. It is explanatory drawing which shows the mode of the water supply operation | work to the reforming water tank. It is a block diagram which shows the outline of a structure of the fuel cell system 110 of a modification. It is a block diagram which shows the outline of a structure of the fuel cell system 210 of a modification. It is a block diagram which shows the outline of a structure of the fuel cell system 310 of a modification.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a 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 receiving supply of a fuel gas containing hydrogen and an oxidant gas (air) containing oxygen. , A hot water supply unit 100 having a hot water storage tank 101 for collecting and supplying hot water generated by the power generation of the power generation unit 20, and a control device 70 for controlling the entire system.

  In addition to the fuel cell stack 36, the power generation unit 20 generates steam by evaporating reformed water and preheats raw fuel gas (for example, natural gas or LP gas), and hydrogen from the raw fuel gas and steam. A power generation module 30 including a reformer 33 that generates fuel gas (reformed gas), a raw fuel gas supply device 40 that supplies the raw fuel gas to the carburetor 32, and air to 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 a waste heat recovery device 60 that recovers the exhaust heat generated in the power generation module 30. Prepare.

  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 the mixed gas of raw fuel gas and steam supplied from the vaporizer 32 is steam-modified. The fuel gas (reformed gas) is reformed by a quality reaction.

  The power generation module 30 (the vaporizer 32, the reformer 33, and the fuel cell stack 36) is housed in a box-shaped module case 31 formed of a heat insulating material. In the module case 31, a combustion unit 34 is provided for supplying heat necessary for starting the fuel cell stack 36, generating steam in the vaporizer 32, and steam reforming reaction in the reformer 33. The combustion unit 34 is supplied with the fuel off-gas (anode off-gas) and the oxidant off-gas (cathode off-gas) that have passed through the fuel cell stack 36, and the mixed gas is ignited and burned by the ignition heater 35, whereby 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 causes the fuel gas remaining in the combustion section 34 to be reburned by the catalyst.

  The exhaust heat recovery device 60 includes a circulation pipe 61 that connects the heat exchanger 62 and a hot water storage tank 101 that stores hot water, and forms a circulation path of the hot water. The circulation pipe 61 is provided with a circulation pump 63. By circulating the hot water using the circulation pump 63, the hot water is heated and heated by heat exchange with the combustion exhaust gas in the heat exchanger 62. Hot water is stored in the hot water storage tank 101. The heat exchanger 62 is connected to the reformed 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. 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. The water purifier 66 is obtained by filling an ion exchange resin in a container in which an inlet into which condensed water flows is formed in the upper part and an outlet from which condensed water flows out is formed in the lower part. Purify the water by removing impurities contained in the water flowing through. 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 exhaust pipe 67 is connected to the exhaust gas outlet of the heat exchanger 62, and the other end side is connected to an exhaust port 67 o formed on the upper surface of the housing 22 by extending upward. The exhaust gas exhausted from the exhaust port 67o is discharged to the outside. 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 includes a raw fuel gas supply pipe 41 that connects the gas supply source 1 and the vaporizer 32. The raw fuel gas supply pipe 41 is provided with a raw fuel gas supply valve 42, a raw fuel gas pump 43, a desulfurizer 44, and the like in order from the gas supply source 1 side, and the raw fuel gas supply valve 42 is opened. Then, the raw fuel gas pump 43 is driven to feed the raw fuel gas from the gas supply source 1 to the vaporizer 32 through the desulfurizer 44. The raw fuel gas supplied to the carburetor 32 is supplied to the reformer 33 via the carburetor 32 and reformed into fuel gas. The desulfurizer 44 removes sulfur contained in the raw fuel gas. For example, a room temperature desulfurization method in which a sulfur compound is adsorbed and removed by an adsorbent such as zeolite can be employed.

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

  The reforming water supply device 55 includes a reforming water supply pipe 56 that connects the reforming water tank 57 that stores the reforming water and the vaporizer 32. A reforming water pump 58 is provided in the reforming water supply pipe 56, and the reforming water in the reforming water tank 57 is supplied to the vaporizer 32 by driving the reforming pump 58. The reformed water supplied to the vaporizer 32 is converted into steam in 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 level of 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 up by the reforming water pump 58. A low water level detection sensor that is turned on when the water level is equal to or higher than Wl; a high water level detection sensor that is turned 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; including.

  The fuel cell stack 36 includes a solid oxide fuel cell including a solid electrolyte made 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 stack, 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 an output terminal of the fuel cell stack 36 via a power conditioner (not shown), and DC power from the fuel cell stack 36 is converted into voltage and DC by the power conditioner. / Additional AC power from a commercial power source via AC conversion is supplied to a 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 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 as described above is required to start the system in a state where the system start condition such as the water level W of the reforming water tank 57 is the low water level W1 or higher (the low water level detection sensor is on) is satisfied. Then, the system startup process is executed. In the system startup process, for example, the corresponding auxiliary devices are sequentially controlled, the fuel component is adsorbed by the desulfurizer 44 to suppress the air-fuel ratio deviation of the mixed gas, the purge process of the combustion unit 34, and the combustion unit 34. This is performed by sequentially executing an off-gas ignition process, a steam reforming process, and the like.

  When the startup of the system is completed, the fuel cell system 10 executes power generation processing. In the power generation process, a target gas flow rate Qg * is set based on the system required output, and the raw fuel gas supply control for controlling the raw fuel gas pump 43 so that the raw fuel gas is supplied at the set target gas flow rate Qg *; An air supply control for setting the target air flow rate Qa * to be a predetermined air-fuel ratio with respect to the gas flow rate Q *, and controlling the air blower 53 so that air is supplied at the set target air flow rate Qa *; A target water amount is set based on the output, and reforming water supply control is performed to control the reforming water pump 58 so that the reforming water is supplied according to the set target water amount.

  In addition, the fuel cell system 10 detects that the water level sensor 59 detects that the water level W in the reformed water tank 57 is not less than the low water level Wl and less 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 on). When it is off), output restriction control is performed to reduce the system required output. Thereby, the condensed water produced | generated with the heat exchanger 62 can be increased, and the water level in the reforming water tank 57 can be recovered.

  Further, when the water level sensor 59 detects that the water level W of the reformed water tank 57 is less than the low water level W1 during power generation (when the low water level detection sensor is off), the fuel cell system 10 operates the system. Stop.

  Here, in the fuel cell system 10, the system is stopped when the reforming water tank 57 is empty, such as when it is newly installed, or when the water level of the reforming water tank 57 is insufficient (the water level W is less than the low water level Wl). In this 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 equal to or higher than the high water level WH. 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 exhaust pipe 67 extending upward is provided on the upper surface of the housing 22, and the exhaust gas exhaust pipe 67 is interposed via a heat exchanger 62 and a condensed water supply pipe 65. It is connected to the reforming tank 57. For this reason, an 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, whereby the exhaust gas exhaust pipe 67, heat exchange from the exhaust port 67o. Water can be supplied to the reforming water tank 57 via the condenser 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 condensed water, the water (tap water) injected from the water supply bottle 90 is ion-exchanged. After being purified by the resin 66 i, it is supplied to the reformed 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 to the exhaust port 67o to supply water. Work can be done.

  During the water supply operation, when an amount of water exceeding the processing capacity is injected into the water purifier 66 (ion exchange resin 66i), 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. Thus, 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 accumulated by the water accumulated on the upstream side of the water purifier 66. Can be prevented from being blocked. As described above, when the water level W of the reforming water tank 57 is equal to or higher than the low water level Wl, the system activation condition is satisfied even during the water supply operation, and the system can be activated. Even if the system is started in the middle of the water supply work, the exhaust gas exhaust pipe 67 and the heat exchanger 62 are prevented from being blocked by the injected water, so that the combustion exhaust generated with the start of the system Gas can be passed through the heat exchanger 62, and the gas component of the combustion exhaust gas can be discharged smoothly through the exhaust gas discharge pipe 67. Here, the buffer tank 64 has a capacity such that 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. It is accumulated upstream of the water purifier 66 when the water level W becomes a low water level Wl at which the system can be activated or when the water level W in the reforming water tank 57 becomes the low water level Wl at which the system can be activated. It is desirable that a capacity is secured so that water does not block the exhaust gas discharge pipe 67 and the heat exchanger 62.

  The fuel cell system 10 of the embodiment described above includes a condensed water supply pipe 65 that supplies condensed water generated by cooling the combustion exhaust gas in the heat exchanger 62 to the reformed water tank 57, and a condensed water supply pipe 65. An exhaust gas exhaust pipe 67 connected to the provided water purifier 66 and an exhaust port 67o formed in the housing 22 and capable of supplying water from the exhaust port 67o to the upstream of the water purifier 66 in the condensed water supply pipe 65. And comprising. Thus, water can be supplied from the exhaust port 67o to the reformed water tank 57 through the exhaust gas discharge pipe 67 and the condensed water supply pipe 65 by injecting water into the exhaust port 67o. Thus, 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 simpler. In addition, since it is possible to supply water to the reforming water tank 57 from the exhaust port 67o formed in the housing 22, compared to the case where the panel of the housing 22 is removed and water is supplied directly to the reforming water tank 57, Water supply work can be facilitated. In addition, since the water supply path to the reforming 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 path is unnecessary, and the system is further simplified. It can be configured.

  In addition, since the fuel cell system 10 of the embodiment includes the buffer tank 64 between the heat exchanger 62 and the water purifier 66, an amount of water exceeding the processing capacity of the water purifier 66 is present in the condensed water supply pipe 65. Even if injected, the water accumulated upstream of the water purifier 66 can be temporarily stored in the buffer tank 64. Thereby, it is possible to prevent the exhaust gas exhaust pipe 67 and the heat exchanger 62 from being blocked by water accumulated upstream of the water purifier 66. Therefore, even during the water supply operation, the system can be started when the water level W of the reforming water tank 57 becomes equal to or higher than the low water level Wl, 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. May be. In this case, the exhaust port 67o (water supply port) is not necessarily 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. However, as shown in the fuel cell system 110 of the modified example of FIG. 3, the buffer tank 64 of the embodiment. Instead of the water purifier 66, a water purifier 166 filled with an ion exchange resin 166i may be provided so that a space 166e is formed in the upper portion of the container 166h. 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. However, as shown in the fuel cell system 210 of the modified example of FIG. It is good also as what adjusts the flow volume of the water inject | poured into the exhaust port 67o from the water supply bottle 290 by providing a throttle (orifice) in 291. In addition, the water 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 according to the modification includes the small-capacity buffer tank 264, the buffer tank 264 may be omitted.

  In the above-described embodiment, water is supplied to the reformed water tank 57 by injecting water from the exhaust port 67o of the exhaust gas discharge pipe 67. However, as shown in a fuel cell system 310 of a modified example of FIG. In addition, a water supply pipe 367 having one end connected to the condensate outlet (upstream of the buffer tank 64) of the heat exchanger 62 and the other end extending upward and connected to the water supply port 367i is provided, and the water supply pipe 367 is provided from the water supply port 367i. Alternatively, water may be supplied to the reformed 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 problems will be described. In the embodiment, the fuel cell stack 36 corresponds to a fuel cell, the reformer 33 corresponds to a reforming unit, the raw fuel gas supply device 40 corresponds to a raw fuel gas supply device, and the reforming water supply device 55 It corresponds to a reforming water supply device, the reforming water tank 57 corresponds to a reforming water tank, the combustion part 34 corresponds to a fuel part, the heat exchanger 62 corresponds to a condensing part, and the condensate water supply pipe 65 It corresponds to a condensed water flow path, the water purifier 66 corresponds to a water purifier, the exhaust gas discharge pipe 67 corresponds to a water supply path, and the exhaust port 67o corresponds to a water supply opening. 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 an exhaust gas flow path. The buffer tanks 64 and 264 and the space 166e of the storage container 166h correspond to the buffer tank. Further, the water level sensor 59 corresponds to a water level sensor. Further, the water supply bottle 290 corresponds to a bottle, and the spout 291 corresponds to an orifice.

  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 is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problem should be made based on the description of the column, and the embodiment of the invention described in the column of means for solving the problem is described. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using embodiment, this invention is not limited to such embodiment at all, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

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

  DESCRIPTION OF SYMBOLS 1 Gas supply source 10, 110, 210, 310 Fuel cell system, 20 Power generation unit, 22 Case, 30 Power generation module, 31 Module case, 32 Vaporizer, 33 Reformer, 34 Combustion part, 35 Ignition heater, 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 Waste heat recovery device, 61 Circulation piping, 62 Heat exchanger, 63 Circulation pump, 64,264 buffer tank, 65 condensed water supply pipe, 66,166 water purifier, 66i, 166i ON exchange resin, 166h storage container, 166e space, 67 exhaust gas discharge pipe, 67o exhaust port, 70 control device, 90,290 water supply bottle, 91,291 spout, 100 hot water supply unit, 101 hot water storage tank, 292 air hole, 367 Water supply pipe, 367i water supply port.

Claims (6)

A fuel cell system including a fuel cell capable of generating electric power based on a reformed gas and an oxidant gas,
A reforming unit that reforms raw fuel gas into reformed gas using reformed water and supplies the reformed gas to the fuel cell;
A raw fuel gas supply device for supplying the raw fuel gas to the reforming unit;
A reforming water supply device that has the reforming water tank for storing the reforming water, and supplies the reforming water in the reforming water tank to the reforming unit;
A combustion section for burning the reformed gas that has passed through the fuel cell;
A condensing part for cooling and condensing the combustion exhaust gas generated by the combustion of the reformed gas;
A condensed water flow path for supplying condensed water generated by cooling the combustion exhaust gas to the reformed water tank;
A water purifier provided in the condensed water flow path;
A water supply path 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 channel;
A fuel cell system comprising: The fuel cell system according to claim 1,
An exhaust gas flow path for discharging the gas component of the combustion exhaust gas cooled in the condensing unit to the outside;
The water supply path is shared with the exhaust gas flow path.
Fuel cell system. The fuel cell system according to claim 2, wherein
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 any one of claims 1 to 3,
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 4, wherein
A water level sensor for detecting the water level of the reformed water tank;
One of the starting conditions is that the 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. A fuel cell system according to any one of claims 1 to 5,
A bottle for supplying water to the water supply port of the water supply channel;
The bottle has an orifice for adjusting the amount of water supplied,
Fuel cell system.

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