JP2020184465A - Fuel cell system - Google Patents

Abstract

To enable water supply from an exhaust port to a reformed water tank while discharging rain water infiltrated in the exhaust port to the outside.SOLUTION: A fuel cell system comprises: a condenser for condensing combustion exhaust gas from a fuel cell; a condensate water path for supplying condensate water condensed by the condenser to a reformed water tank; a water purifier provided on the condensate water path; an exhaust port provided on an upper part of a frame; and an exhaust path for sending a gas component of combustion exhaust gas having passed through the condenser to the exhaust port. By using a water supply bottle, water can be supplied from the exhaust port to the reformed water tank via the exhaust path and the condensate water path. The fuel cell system further comprises a water discharge path connected to the exhaust port to discharge water infiltrated in the exhaust port to the outside, the water discharge path connected to a bottom surface of the cylindrical exhaust port, the exhaust path connected to a side surface of the exhaust port. The water supply bottle includes: a cylindrical fitting part to be fitted into the exhaust port; and a water supply hole formed on a side surface of the fitting part so as to communicate with the exhaust path in a state in which the fitting part is fitted into the exhaust port.SELECTED DRAWING: Figure 6

Description

The present invention relates to a fuel cell system capable of supplying water to a reformed water tank using a water supply bottle.

Conventionally, as this type of fuel cell system, a heat exchanger that cools and condenses the combustion exhaust gas that has passed through the fuel cell, and a condensed water flow path that supplies the condensed water generated by cooling the combustion exhaust gas to the reformed water tank. A water purifier provided in the condensed water flow path, an exhaust port formed on the upper surface of the housing, and an exhaust gas flow path for sending the gas component of the combustion exhaust gas cooled by the heat exchanger to the exhaust port. It has been proposed that water can be supplied to the reformed water tank while being purified by a water purifier via the exhaust gas flow path and the condensed water flow path by pouring water from the water supply bottle into the exhaust port (for example). See Patent Document 1). In this fuel cell system, by using the exhaust gas flow path as a water supply channel for supplying water to the reformed water tank, a dedicated water supply channel is not required and a simple configuration can be achieved.

JP-A-2019-29323

However, in the fuel cell system described above, since the exhaust port is formed on the upper surface of the housing, rainwater may enter the exhaust gas flow path through the exhaust port.

A main object of the fuel cell system of the present invention is to provide a fuel cell system capable of discharging rainwater that has entered the exhaust port to the outside and supplying water from the exhaust port to the reformed water tank.

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
Fuel cells that can generate electricity based on reformed gas and oxidant gas,
A reformer that reforms raw fuel gas into the reformed gas using reformed water,
A raw fuel gas supply device that supplies the raw material gas to the reformer, and
A reformed water supply device having a reformed water tank for storing the reformed water and supplying the reformed water in the reformed water tank to the reformer.
A combustion unit that burns off-gas of the reformed gas that has passed through the fuel cell,
A condenser that condenses the combustion exhaust gas generated by the combustion of the off-gas, and
A condensing water channel connected to the condenser and the reforming water tank and supplying the condensed water condensed by the condenser to the reforming water tank.
A water purifier provided in the condensed water channel to purify the water flowing through the condensed water channel,
An exhaust port provided at the top of the housing that extends vertically and opens in a tubular shape.
An exhaust passage that is connected to the condenser and the exhaust port and sends the gas component of the combustion exhaust gas that has passed through the condenser to the exhaust port.
With
A fuel cell system capable of supplying water from the exhaust port to the reformed water tank via the exhaust passage and the condensed water passage using a water supply bottle.
It has a drainage channel that is connected to the exhaust port and discharges the water that has entered the exhaust port to the outside.
The drainage channel is connected to the bottom surface of the exhaust port.
The exhaust passage is connected to the side surface of the exhaust port.
The water supply bottle has a tubular fitting portion that is fitted to the exhaust port when water is supplied to the reformed water tank, and the exhaust passage in a state where the fitting portion is fitted to the exhaust port. It has a water supply hole formed on the side surface of the fitting portion so as to communicate with each other.
The gist is that.

In the fuel cell system of the present invention, a condenser that condenses the combustion exhaust gas generated by combustion of off-gas of the fuel cell, a condensed water channel that supplies the condensed water condensed by the condenser to the reformed water tank, and a condensed water channel. A water purifier provided in the above, an exhaust port provided in the upper part of the housing of the fuel cell system, and an exhaust path for sending the gas component of the combustion exhaust gas that has passed through the condenser to the exhaust port. It can be used to supply water to the reformed water tank from the exhaust port via the exhaust channel and the condensed water channel. The fuel cell system further comprises a drainage channel that is connected to the exhaust port and drains water that has entered the exhaust port to the outside, the drainage channel is connected to the bottom surface of the tubular exhaust port, and the exhaust path is the said. It is connected to the side of the exhaust port. Then, the water supply bottle communicates with the exhaust passage with the tubular fitting portion fitted to the exhaust port when water is supplied to the reformed water tank and the fitting portion fitted to the exhaust port. It has a water supply hole formed on the side surface of the fitting portion. As a result, the water bottle is filled with water, and the fitting portion of the water bottle is fitted to the exhaust port provided at the upper part of the housing, so that the water supply hole of the water bottle and the exhaust passage are communicated with each other, and the water bottle is connected. The water inside can be supplied from the water supply hole to the reformed water tank via the exhaust channel and the condensed water channel. Further, even if rainwater enters the exhaust port provided at the upper part of the housing, the drainage channel connected to the bottom of the exhaust port is provided without flowing the infiltrated rainwater to the exhaust port connected to the side surface of the exhaust port. It can be discharged to the outside through.

In such a fuel cell system of the present invention, the water supply bottle has a through hole formed in an end surface of the fitting portion so as to communicate with the drainage channel in a state where the fitting portion is fitted to the exhaust port. It may have a hose that is connected to the through hole and extends from the through hole to the inside of the water supply bottle to introduce air into the inside of the water supply bottle. In this way, the water in the water supply bottle is pushed out from the water supply hole by the air introduced into the water supply bottle via the hose, so that the water supply to the reformed water tank can be smoothly performed.

In the fuel cell system of the present invention of this aspect, the water supply bottle has a seal portion around the through hole on the end surface of the fitting portion, and the sealing portion has the fitting portion fitted to the exhaust port. In the combined state, it may be in contact with the periphery of the opening of the drainage channel on the bottom surface of the exhaust port. In this way, it is possible to prevent the water discharged from the water supply hole of the water supply bottle from leaking to the drainage channel side.

It is a block diagram which shows the outline of the structure of the fuel cell system 20 of this embodiment. It is explanatory drawing which shows the water supply route to a reforming water tank 61. It is an external perspective view of a water supply bottle 100. It is an exploded perspective view of the water supply bottle 100. It is explanatory drawing which shows the state of setting the water supply bottle 100 in the exhaust pipe 22. It is a partial cross-sectional view of the state which the water supply bottle 100 is set in the exhaust pipe 22.

A mode for carrying out the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram showing an outline of the configuration of the fuel cell system 20 of the present embodiment. As shown in FIG. 1, the fuel cell system 20 of the present embodiment includes a power generation module 30, a raw fuel gas supply device 40, an air supply device 50, a reformed water supply device 60, and an exhaust heat recovery device 70. , And a control device 80.

The power generation module 30 generates steam by evaporating the reformed water and the fuel cell stack 31 that generates power by being supplied with a fuel gas containing hydrogen (reforming gas) and an oxidizing agent gas (air) containing oxygen. It also has a vaporizer 32 that preheats a raw material fuel gas (for example, natural gas or LP gas), and a reformer 33 that generates a fuel gas (reformed gas) from the raw material fuel gas and steam.

The fuel cell stack 31 is laminated with a 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 solid oxide fuel cell, 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. The output terminal of the fuel cell stack 31 is connected to a power line connecting a commercial power source and a load via a power conditioner (not shown). The DC power output from the fuel cell stack 31 to the output terminal is added to the AC power from the commercial power source through voltage conversion and DC / AC conversion by the power conditioner and supplied to the load.

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 that has passed through the vaporizer 32. It reforms into fuel gas (reforming gas) by the reaction.

The raw material fuel gas supply device 40 is provided in the raw material fuel gas supply pipe 41 connecting the gas supply source 10 for supplying the raw material fuel gas and the vaporizer 32, and the raw material fuel gas supply pipe 41 in order from the gas supply source 1 side. It has a raw fuel gas supply valve 42 (double valve), a raw fuel gas pump 43, and a desulfurizer 44. The raw fuel gas supply device 40 operates the raw fuel gas pump 43 with the raw fuel gas supply valve 42 opened, so that the raw fuel gas from the gas supply source 1 is sent to the vaporizer 32 via the desulfurization device 44. Supply. 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 raw material fuel gas supplied to the vaporizer 32 is preheated by the vaporizer 32 and then supplied to the reformer 33 to be reformed into a fuel gas. Then, the reformed fuel gas is supplied to the anode of the fuel cell stack 31 via the manifold 36.

The air supply device 50 has an air supply pipe 52 that connects the filter 51 that communicates with the outside air and the fuel cell stack 31, and an air blower 53 that is provided in the air supply pipe 52. By operating the air blower 53, the air supply device 50 supplies the air sucked through the filter 51 to the cathode of the fuel cell stack 31.

The reforming water supply device 60 is provided in the reforming water tank 61 for storing the reforming water, the reforming water supply pipe 62 for connecting the reforming water tank 61 and the vaporizer 32, and the reforming water supply pipe 62. It has a reforming water pump 63 and the like. The reforming water supply device 60 supplies the reforming water of the reforming water tank 61 to the vaporizer 32 by operating the reforming pump 58. 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 61 is provided with a water level sensor 64 for detecting the water level of the stored reforming water.

The fuel cell stack 31, the vaporizer 32, and the reformer 33 are housed in a box-shaped module case 38 formed of a heat insulating material. The module case 38 is provided with a combustion unit 34 for starting the fuel cell stack 31, 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 31 are supplied to the combustion unit 34, and the mixed gas is ignited by the ignition heater 35 and burned to generate combustion heat. Is supplied to the fuel cell stack 31, the vaporizer 32, and the reformer 33. The combustion exhaust gas generated by the combustion of the fuel off gas and the oxidant off gas is supplied to the heat exchanger 75 via the combustion catalyst 37. The combustion catalyst 37 is an oxidation catalyst that reburns the off-gas remaining unburned in the combustion unit 34 by the catalyst.

The exhaust heat recovery device 70 circulates with a hot water storage tank 71 for storing hot water, a heat exchanger 75, and a circulation pipe 72 for connecting the hot water storage tank 71 and the heat exchanger 75 to form a circulation path for the hot water. It has a circulation pump 73 provided in the pipe 72. The exhaust heat recovery device 70 operates a circulation pump 73 to circulate the hot water stored, so that the hot water is taken out from the lower part of the hot water storage tank 71 and heated by heat exchange with the combustion exhaust gas in the heat exchanger 75. The heated hot water is returned to the upper part of the hot water storage tank 71. The heat exchanger 75 is connected to the reforming water tank 61 via the condensed water supply pipe 76 and communicates with the outside air via the exhaust pipe 23. The combustion exhaust gas supplied to the heat exchanger 75 is cooled by heat exchange with the hot water, and the water vapor component is condensed and collected in the reformed water tank 61 via the condensed water supply pipe 76. Further, the remaining exhaust gas is discharged to the outside air through the exhaust pipe 23.

A water purifier 77 is provided in the condensed water supply pipe 76. In the water purifier 77, an ion exchange resin 77i 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. Removes impurities contained in the condensed water when the ion exchange resin 77i is circulated to purify the water. The ion exchange resin 77i is a mixture of an anion resin as an anion exchange resin and a cation resin as a cation exchange resin in a predetermined ratio.

One end side of the exhaust pipe 23 is connected to the exhaust gas outlet of the heat exchanger 75, and the other end side extends upward and is connected to the exhaust pipe 22 formed on the upper surface of the housing 21, and is discharged from the heat exchanger 75. The gas component of the burned exhaust gas is discharged from the exhaust stack 22 to the outside. The exhaust pipe 22 is a cylindrical (cylindrical) member that extends vertically and opens at the upper end, and an exhaust pipe 23 is connected to the side surface of the exhaust pipe 22 and is located at the center of the bottom surface of the exhaust pipe 22. Is connected to a drainage pipe 24 for discharging water (rainwater or the like) that has entered the exhaust pipe 22 to the outside.

The control device 80 is configured as a microprocessor centered on a CPU, and includes a ROM, RAM, and an input / output port in addition to the CPU. The control device 80 includes a gas flow rate sensor that detects the flow rate of the raw fuel gas flowing through the raw material fuel gas supply pipe 41 per unit time, and an air flow rate sensor that detects the flow rate of the air flowing through the air supply pipe 52 per unit time. The detection signal from the water level sensor 64 or the like is input via the input port. On the other hand, a drive signal is output from the control device 80 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 63, the circulation pump 73, and the like via the output port. ..

The fuel cell system 20 configured in this way executes the system startup process when the system startup is requested while the system startup conditions such as the water level of the reforming water tank 61 being equal to or higher than the predetermined water level are satisfied. To do. 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.

The fuel cell system 20 executes power generation processing when the system startup is completed. 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 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 the gas flow rate Qg * has a predetermined air-fuel ratio, and controls the air blower 53 so that air is supplied according to the set target air flow rate Qa *, and system requirements. A target water amount is set based on the output, and a reforming water supply control that controls the reforming water pump 63 so that the reforming water is supplied according to the set target water amount is executed.

Here, in the fuel cell system 20, when the reforming water tank 61 is empty, such as when it is newly installed, it is necessary to supply water (filling) the reforming water tank 61 in order to start the system. Become. FIG. 2 is an explanatory diagram showing a water supply route to the reforming water tank 61. As described above, the exhaust pipe 23 is connected to the exhaust pipe 22, and the heat exchanger 75 is connected to the exhaust pipe 23. Therefore, as a water supply operation, water (tap water) is poured into the exhaust pipe 22 to supply water from the exhaust pipe 22 to the reforming water tank 61 via the exhaust pipe 23, the heat exchanger 75, and the condensed water supply pipe 76. be able to. At this time, the water poured into the exhaust stack 22 is purified by the ion exchange resin 77i of the water purifier 77 provided in the condensed water supply pipe 76 when passing through the condensed water supply pipe 76. As described above, the water purifier 77 is provided in the condensed water supply pipe 76 in order to purify the condensed water condensed by cooling the combustion exhaust gas in the heat exchanger 75. Therefore, by including the condensed water supply pipe 76 in the water supply path during the water supply work to the reformed water tank 61, the purification of the water (tap water) used for the water supply and the purification of the condensed water can be performed by a single water purifier 77. Can be done at.

The mixing ratio of the anionic resin and the cationic resin of the ion exchange resin 77i to be filled in the water purifier 77 is determined as follows. For example, when tap water is used to supply water to the reformed water tank 61, the mixing ratio of the anionic resin and the cationic resin required for treating the tap water with the water purifier 77 is about 1: 1. Further, the mixing ratio of the anionic resin and the cationic resin required for treating the condensed water in which the combustion exhaust gas is condensed by the water purifier 77 is about 10: 1. Here, when the treatment of tap water and the treatment of condensed water are performed using separate water purifiers, the water purifier for tap water treatment is filled with anion resin and cation resin at a mixing ratio of 1: 1. However, in a water purifier for condensing water treatment, if the ratio of anionic resin to cationic resin is greatly biased as 10: 1, the original adsorption function of the ion exchange resin will deteriorate. Generally, the anion resin and the cationic resin are filled in a mixing ratio of about 2: 1. For example, when the filling amount of the anion resin is 2 and the filling amount of the cationic resin is 2 in the water purifier for tap water treatment, the filling amount of the anion resin is set in the water purifier for the condensed water treatment. Is 10, the filling amount of the cationic resin is 5, and the required filling amount of the ion exchange resin is 19 in total. In this case, only 1 out of 5 which is the filling amount of the cationic resin in the water purifier for condensing water treatment is used, and 4 is not used. On the other hand, when the treatment of tap water and the treatment of condensed water are performed by a single water purifier 77 as in the present embodiment, the cationic resin not used in the treatment of condensed water is treated with tap water. Can be used for. That is, it is sufficient to add 2 which is the filling amount of the anion resin required for tap water treatment to 12 which is the filling amount of the anion resin required for the condensed water treatment to obtain 12, and the cationic resin is used for the tap water treatment. Since it is not necessary to add the ion exchange resin, the total filling amount of the ion exchange resin is 17. By purifying tap water and condensed water having different water qualities with one water purifier 77 in this way, the cation resin that is not used in the treatment of condensed water can be used in the treatment of tap water as a whole. The filling amount of the ion exchange resin can be reduced.

FIG. 3 is an external perspective view of the water supply bottle 100, and FIG. 4 is an exploded perspective view of the water supply bottle 100. Further, FIG. 5 is an explanatory view showing how the water supply bottle 100 is set in the exhaust stack 22, and FIG. 6 is a partial cross-sectional view in a state where the water supply bottle 100 is set in the exhaust stack 22. As shown in the figure, the water supply bottle 100 includes a bottle body 101 formed of a soft resin (for example, polyethylene) having a cylindrical opening 101a, a hollow joint 110 connected to the opening 101a of the bottle body 101, and a hollow joint 110. It is provided with a long and cylindrical air hose 120. The joint 110 is configured as a hollow stepped cylindrical member, and is a cylindrical connection having a spiral groove formed on the inner peripheral surface so as to be screwed into a spiral groove formed on the outer peripheral surface of the opening 101a of the bottle body 101. It has a portion 111 and a bottomed cylindrical tip portion 112 formed in a cylindrical shape with an outer diameter slightly smaller than the inner diameter of the exhaust stack 22. A circular water supply hole 112a is formed on the side surface of the tip portion 112, and a circular air introduction hole 112b is formed on the central portion of the end face of the tip portion 112. Further, as shown in FIG. 5, an annular sealing member 113 formed of an elastic material such as rubber is provided around the air introduction hole 112b on the end surface of the tip portion 112. As shown in FIG. 4, in a state where one end side of the air hose 120 is inserted into the air introduction hole 112b from the back side of the joint 110, the joint 110 is attached to the bottle body 101, so that the other end side of the air hose 120 is shown in FIG. As shown in 3, it projects inside the bottle body 101.

To assemble the water supply bottle 100, the bottle body 101 is filled with water (tap water) using, for example, a hose, and the air hose 120 is inserted into the air introduction hole 112b from the back side of the joint 110, and then the connecting portion 111 of the joint 110 is assembled. Is attached to the opening 101a of the bottle body 101 by screwing. Then, as shown in FIG. 5, the water supply bottle 100 is set in the exhaust stack 22 by turning the water supply bottle 100 upside down and inserting the tip 112 of the joint 110 into the exhaust stack 22. When the water supply bottle 100 is set in the exhaust stack 22, the water supply hole 112a formed on the side surface of the tip 112 of the joint 110 communicates with the exhaust pipe 23 connected to the side surface of the exhaust stack 22, and the water in the bottle body 101 is discharged. The water is discharged from the water supply hole 112a toward the exhaust pipe 23 through the space formed between the inner peripheral surface of the tip 112 of the joint 110 and the outer peripheral surface of the air hose 120. The water supply hole 112a is formed as an orifice, and the amount of water discharged from the water supply bottle 100 is controlled by the water supply hole 112a (orifice). In addition, when the water supply bottle 100 is set in the exhaust pipe 22, the air introduction hole 112b formed in the end surface of the tip 112 of the joint 110 communicates with the drain pipe 24 connected to the bottom surface of the exhaust pipe 22, and the drain pipe 24 Since the air inside is introduced into the bottle body 101 via the air hose 120, the negative pressure acting on the inside of the bottle body 101 due to water discharge can be reduced, and the water discharge rate can be kept constant.

In the fuel cell system 10 of the present embodiment, the heat exchanger 75 is arranged between the exhaust stack 22 and the water purifier 77, and the combustion catalyst 37 is located upstream of the combustion exhaust gas flow path of the heat exchanger 75. Because of the arrangement, when a large amount of tap water is poured from the water supply bottle 100 into the exhaust stack 22 at one time, the tap water flowing into the water purifier 77 overflows beyond the processing capacity of the water purifier, and the water surface becomes hot. It may reach the combustion catalyst 37 beyond the exchanger 75. In this case, the combustion catalyst 37 reacts with chlorine contained in tap water, which may reduce the performance. In the present embodiment, the water supply hole 112a (orifice) does not discharge water above a certain flow rate from the water supply bottle 100, and the water discharge rate is kept constant by introducing air through the air hose 120, so that the water purifier An amount of water commensurate with the processing capacity of 77 can be discharged from the water supply bottle 100, and the tap water flowing into the water purifier 77 overflows beyond the processing capacity of the water purifier 77 and reaches the combustion catalyst 37. It can be prevented satisfactorily. As a result, the water supply operation can be performed smoothly and in a short time without deteriorating the performance of the combustion catalyst 37. In the present embodiment, water is supplied at a flow rate of 500 mL / min or less so that the utilization rate of the resin of the water purifier 77 is 60% or more. This eliminates the need to fill with excess resin, and makes it possible to reduce the size and cost of the water purifier 77.

Further, since the seal member 113 is provided around the air introduction hole 112b on the end surface of the tip end portion 112 of the joint 110, the seal member 113 is in the exhaust pipe 22 with the water supply bottle 100 set in the exhaust pipe 22. The air introduction hole 112b and the drainage pipe 24 are sealed by abutting (adhering) to the periphery of the connection portion (opening) of the drainage pipe 24 on the bottom surface of the 22. As a result, it is possible to prevent the water discharged from the water supply hole 112a of the water supply bottle 100 from leaking to the drainage pipe 24 side.

When the water supply bottle 100 becomes empty, the operator pulls out the water supply bottle 100 from the exhaust stack 22, disassembles the water supply bottle 100 into a bottle body 101, a joint 110, and an air hose 120, and folds the bottle body 101 in a bellows shape. , Complete the water supply work. Then, the fuel cell system 20 is started. When the water supply bottle 100 is removed from the exhaust pipe 22, the exhaust pipe 22 opens at the upper surface of the housing 21, and water such as rainwater may infiltrate there. However, in the present embodiment, the exhaust pipe 23 Is connected to the side surface of the exhaust pipe 22, and the drain pipe 24 is connected to the bottom surface of the exhaust pipe 22. Therefore, even if water enters the exhaust pipe 22, the water that has entered does not flow toward the exhaust pipe 23. It can be discharged to the outside through the drain pipe 24.

In the fuel cell system 20 of the embodiment described above, the heat exchanger 75 that condenses the combustion exhaust gas generated by the combustion of the off-gas of the fuel cell stack 31 and the reformed water tank that condenses the condensed water by the heat exchanger 75. Condensed water supply pipe 76 supplied to 61, water purifier 77 provided in the condensed water supply pipe 76, exhaust stack 22 formed on the upper surface of the housing 21, and combustion exhaust gas passing through the heat exchanger 75. A reformed water tank including an exhaust pipe 23 for sending a gas component to the exhaust pipe 22, and purifying with a water purifier 77 from the exhaust pipe 22 through the exhaust pipe 23 and the condensed water supply pipe 76 using the water supply bottle 100. Water can be supplied to 61. The fuel cell system 20 includes a drainage pipe 24 that is connected to the exhaust pipe 22 and discharges water that has entered the exhaust pipe 22 to the outside. The drainage pipe 24 is connected to the bottom surface of the exhaust pipe 22, and the exhaust pipe 23 , Connected to the side surface of the exhaust stack 22. The water supply bottle 100 has a tubular tip portion 112 that is fitted to the exhaust pipe 22 when water is supplied to the reforming water tank 61, and an exhaust pipe 23 with the tip portion 112 fitted to the exhaust pipe 22. It has a water supply hole 112a formed on the side surface of the tip portion 112 so as to communicate with the water supply hole 112a. As a result, the water supply bottle 100 is filled with water, and the tip 112 of the water supply bottle 100 is fitted into the exhaust pipe 22, so that the water supply hole 112a of the water supply bottle 100 and the exhaust pipe 23 communicate with each other, and the inside of the water supply bottle 100. Water can be supplied from the water supply hole 112a to the reforming water tank 61 via the exhaust pipe 23 and the condensed water supply pipe 76. Further, since the drainage pipe 24 is connected to the bottom of the exhaust pipe 22, even if water such as rainwater intrudes into the exhaust pipe 22, the drainage pipe 24 is connected without directing the infiltrated water toward the exhaust pipe 23. It can be discharged to the outside through.

Moreover, the water supply bottle 100 has an air introduction hole 112b formed on the end surface of the tip portion 112 so as to communicate with the drainage pipe 24 in a state where the tip portion 112 is fitted to the exhaust pipe 22, and one end of the air introduction hole 112b. The air hose 120 is connected and the other end projects into the inside of the bottle body 101. As a result, the water in the bottle body 101 is pushed out from the water supply hole 112a by the air introduced into the bottle body 101 via the air hose 120, so that the water supply to the reforming water tank 61 can be smoothly performed.

Further, the water supply bottle 100 has a seal portion 113 around the air introduction hole 112b on the end surface of the tip portion 112, and the seal portion 113 has the exhaust pipe 22 in a state where the tip portion 112 is fitted to the exhaust pipe 22. In contact (close contact) with the periphery of the opening of the drainage pipe 24 on the bottom surface of the drainage pipe 24. As a result, it is possible to prevent the water discharged from the water supply hole 112a of the water supply bottle 100 from leaking to the drainage pipe 24 side.

In the above-described embodiment, the water supply bottle 100 is connected to an air introduction hole 112b formed in the end surface of the tip end portion 112 of the joint 110, one end side is connected to the air introduction hole 112b, and the other end side extends inside the bottle body 101. The drainage pipe 24 connected to the bottom surface of the exhaust stack 22 and the air introduction hole 112b communicate with each other in a state where the air hose 120 is provided and the tip 112 of the joint 110 is fitted to the exhaust stack 22. Air is introduced into the bottle body 101 via the air hose 120. However, an air introduction hole may be directly formed at the bottom of the bottle body 101.

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 31 corresponds to the "fuel cell", the reformer 33 corresponds to the "reformer", and the raw fuel gas supply device 40 corresponds to the "raw fuel gas supply device". The quality water supply device 60 corresponds to the "reformed water supply device", the reformed water tank 61 corresponds to the "reformed water tank", the combustion unit 34 corresponds to the "fuel unit", and the heat exchanger 75 The condensed water supply pipe 76 corresponds to the "condensed water channel", the water purifier 77 corresponds to the "water purifier", the exhaust stack 22 corresponds to the "exhaust port", and the exhaust pipe corresponds to the "condenser". 23 corresponds to the "exhaust channel", the housing 21 corresponds to the "housing", the drainage pipe 24 corresponds to the "drainage channel", the water supply bottle 100 corresponds to the "water supply bottle", and the tip of the joint 110. The portion 112 corresponds to the “fitting portion”, and the water supply hole 112a corresponds to the “water supply hole”. Further, the air introduction hole 112b corresponds to the "through hole", and the air hose 120 corresponds to the "hose". Further, the seal member 113 corresponds to the “seal portion”.

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.

10 gas source, 20 fuel cell system, 21 housing, 22 exhaust stack, 23 exhaust gas pipe, 24 drain pipe, 30 power generation module, 31 fuel cell stack, 32 vaporizer, 33 reformer, 34 combustion part, 35 Ignition heater, 36 manifold, 37 combustion catalyst, 38 module case, 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 Filter, 52 air supply pipe, 53 air blower, 60 reformed water supply device, 61 reformed water tank, 62 reformed water supply pipe, 63 reformed water pump, 64 water level sensor, 70 exhaust heat recovery device, 71 hot water storage tank, 72 Circulation pipe, 73 Circulation pump, 75 Heat exchanger, 76 Condensed water supply pipe, 77 Water purifier, 77i ion exchange resin, 80 controller, 100 water supply bottle, 101 bottle body, 101a opening, 110 joint, 111 connection Part, 112 tip part, 112a water supply hole, 112b air introduction hole, 113 seal member, 120 air hose.

Claims (3)

Fuel cells that can generate electricity based on reformed gas and oxidant gas,
A reformer that reforms raw fuel gas into the reformed gas using reformed water,
A raw fuel gas supply device that supplies the raw material gas to the reformer, and
A reformed water supply device having a reformed water tank for storing the reformed water and supplying the reformed water in the reformed water tank to the reformer.
A combustion unit that burns off-gas of the reformed gas that has passed through the fuel cell,
A condenser that condenses the combustion exhaust gas generated by the combustion of the off-gas, and
A condensing water channel connected to the condenser and the reforming water tank and supplying the condensed water condensed by the condenser to the reforming water tank.
A water purifier provided in the condensed water channel to purify the water flowing through the condensed water channel,
An exhaust port provided at the top of the housing that extends vertically and opens in a tubular shape.
An exhaust passage that is connected to the condenser and the exhaust port and sends the gas component of the combustion exhaust gas that has passed through the condenser to the exhaust port.
With
A fuel cell system capable of supplying water from the exhaust port to the reformed water tank via the exhaust passage and the condensed water passage using a water supply bottle.
It has a drainage channel that is connected to the exhaust port and discharges the water that has entered the exhaust port to the outside.
The drainage channel is connected to the bottom surface of the exhaust port.
The exhaust passage is connected to the side surface of the exhaust port.
The water supply bottle has a tubular fitting portion that is fitted to the exhaust port when water is supplied to the reformed water tank, and the exhaust passage in a state where the fitting portion is fitted to the exhaust port. It has a water supply hole formed on the side surface of the fitting portion so as to communicate with each other.
Fuel cell system. The fuel cell system according to claim 1.
The water supply bottle is connected to a through hole formed in the end surface of the fitting portion so as to communicate with the drainage channel in a state where the fitting portion is fitted to the exhaust port, and is connected to the through hole. It has a hose that extends from the through hole to the inside of the water supply bottle and introduces air into the inside of the water supply bottle.
Fuel cell system. The fuel cell system according to claim 2.
The water supply bottle has a seal portion around the through hole on the end face of the fitting portion.
The seal portion abuts around the opening of the drainage channel on the bottom surface of the exhaust port with the fitting portion fitted to the exhaust port.
Fuel cell system.