JP5331596B2 - Fuel cell system - Google Patents

Description

  The present invention relates to a fuel cell system capable of supplying hot water using exhaust heat from a fuel cell or the like.

  It is known to supply hot water using exhaust heat of a fuel cell, and a fuel cell system including a hot water storage tank and a fuel cell used for hot water supply is known.

  Patent Document 1 describes a hot water tank integrated fuel cell in which a fuel cell and a hot water tank are installed in the same casing. Patent Document 2 describes a fuel cell system in which a fuel cell and a hot water tank are aligned and integrated. Patent Document 3 describes a fuel cell cogeneration system in which a fuel cell and a hot water tank are stored in an outer case. Patent Document 4 describes a fuel cell cogeneration system including a hot water storage tank and a fuel cell.

JP 2001-229929 A JP 2007-26826 A JP 2003-214712 A JP 2008-204834 A

  However, in the conventional fuel cell system, there is room for further improvement in terms of recovering heat radiation from the high temperature portion of the fuel cell or the like to the environment, and in terms of overall efficiency.

  An object of the present invention is to provide a fuel cell system that can suppress heat loss from a high-temperature portion such as a fuel cell and increase the overall efficiency.

  According to the present invention, the following fuel cell system is provided.

1)
A fuel cell system comprising at least a fuel cell and a hot water storage tank for storing hot water heated by heat generated by power generation of the fuel cell,
The hot water storage tank has a hot water storage area that is an area for storing the hot water,
The fuel cell system, at least some of the portions can be a higher temperature than the hot water storage maximum temperature during operation, it is arranged in a region surrounded by at least two directions to the hot water receiving region, and,
A fuel cell is disposed in a region surrounded by the hot water storage region from at least two directions; and
The fuel cell system includes a hydrogen production apparatus that reforms a hydrocarbon fuel to produce a hydrogen-containing gas,
At least a part of the hydrogen production device is disposed in a region surrounded by the hot water storage region from at least two directions, and
A fuel cell exhaust gas channel, which is a channel through which exhaust gas discharged from the fuel cell circulates, is disposed in a region surrounded by the hot water storage region from at least two directions; and
A heat exchanger for exchanging heat between the hot water and the fuel cell exhaust gas, comprising the partitioned hot water flow path and the fuel cell exhaust gas flow path, wherein the hot water storage area is the hot water storage Arranged in an area surrounded by the area from at least two directions, and
A water vaporizer that vaporizes water flowing through the water flow path, including a water flow path that is a flow path through which partitioned water flows and the fuel cell exhaust gas flow path, is provided in the hot water storage area. Arranged in the area surrounded from two directions, and
The fuel cell system, wherein the heat exchanger and the water vaporizer are formed by dividing a low-temperature fluid side flow path of one heat exchanger into two by a partition plate .

2)
The heat exchanger and the water vaporizer were formed by dividing the shell side of one shell and tube type heat exchanger into two by a partition plate,
1) The fuel cell system according to the above.

3 )
The fuel cell system according to 1) or 2) , wherein the water vaporizer and heat generating means for heating the hot water are arranged in a region surrounded by the hot water storage region from at least two directions.
4)
A heat exchange structure capable of heating the hot water supplied from the hot water storage area by heat exchange with the heat generated by the heat generating means; and
A pipe for discharging the hot water heated by the heat exchange structure to the outside of the fuel cell system;
3) The fuel cell system according to the description.

5 )
The region surrounded by at least two directions in the hot water storage region includes a region buried in the hot water storage region,
The fuel cell system according to any one of 1) to 4 ).

6 )
The fuel cell system according to any one of 1) to 5 ), wherein the fuel cell is a solid oxide fuel cell.

  The present invention provides a fuel cell system that can suppress heat loss from a high-temperature portion such as a fuel cell and increase the overall efficiency.

It is a schematic diagram for demonstrating the form of this invention, (a) is a top view, (b) is a front view, (c) is a side view. It is a schematic diagram for demonstrating another form of this invention, (a) is a top view, (b) is a front view, (c) is a side view. It is a schematic diagram for demonstrating another form of this invention, (a) is a top view, (b) is a front view, (c) is a side view. It is a schematic diagram for demonstrating another form of this invention, (a) is a top view, (b) is a front view, (c) is a side view. It is a schematic diagram for demonstrating another form of this invention, (a) is a top view, (b) is a front view, (c) is a side view. It is typical sectional drawing for demonstrating another form of this invention. It is typical sectional drawing for demonstrating another form of this invention. It is typical sectional drawing for demonstrating another form of this invention. It is typical sectional drawing for demonstrating another form of this invention. It is typical sectional drawing for demonstrating another form of this invention. It is typical sectional drawing for demonstrating another form of this invention.

Hereinafter, although the form of this invention is demonstrated suitably using drawing, this invention is not limited by this. However, the forms shown in FIGS. 6 to 8 are for reference.

[Fuel cell system]
The fuel cell system is a device that includes a fuel cell and generates power using the fuel cell. The fuel cell system of the present invention also has a hot water storage tank for storing hot water heated by heat generated by power generation of the fuel cell.

  For example, a fuel cell generates electricity by electrochemically reacting hydrogen and oxygen, and heat is generated along with this electricity generation. For example, by providing a water flow path inside the fuel cell, using the thermal energy of the fluid discharged from the fuel cell, or using radiant heat from the fuel cell, the water is heated to Can be obtained. The hot water storage tank is a tank for storing the hot water thus obtained. Therefore, the hot water storage tank has a hot water storage area that is an area for storing hot water. The hot water storage area may be the entire interior of the hot water tank or may be a part of the hot water tank.

  Fuel cells include polymer electrolyte fuel cells (PEFC), phosphoric acid fuel cells (PAFC), molten carbonate fuel cells (MCFC), solid oxide fuel cells (SOFC), etc. A known fuel cell capable of obtaining warm water by heating water can be used as appropriate.

  The present invention is particularly effective when using a high-temperature fuel cell such as MCFC or SOFC, which tends to have a large heat loss from the fuel cell, and further effective when using SOFC.

  Known components of the fuel cell system can be appropriately provided as necessary. For example, a desulfurizer that reduces sulfur content in hydrocarbon fuels such as city gas and kerosene; a reformer that produces hydrogen-containing gas (reformed gas) from hydrocarbon fuels through a reforming reaction A shift reactor that reduces the carbon monoxide concentration in the reformed gas by a shift reaction; a selective oxidation reactor that further reduces the carbon monoxide concentration in the reformed gas by selectively oxidizing; vaporization that vaporizes the liquid; Pressure increasing means such as pumps, compressors, blowers, etc. for pressurizing various fluids; flow rate adjusting means such as valves for adjusting the flow rate of the fluid or shutting off / switching the flow of the fluid, and the flow path blocking / switching Means; Heat exchanger for heat exchange and heat recovery; Condenser for condensing gas; Heating / warming means for externally heating various equipment with steam, etc .; Storage means for hydrocarbon fuels and combustibles; Instrumentation Air or electrical system; signal system for control; the control device; electrical system for output and power; and insulation material and the like.

  At least a part of the portion of the fuel cell system that can reach a temperature higher than the maximum hot water storage temperature during operation is disposed in a region surrounded by the hot water storage region from at least two directions. Hereinafter, a region surrounded by the hot water storage region from at least two directions will be referred to as a surrounding region.

  The hot water storage maximum temperature is the maximum temperature of hot water in the hot water tank that is set in advance and is controlled during operation of the fuel cell system.

  In the present invention, “heat generation due to power generation of the fuel cell” does not necessarily mean only heat generation in the fuel cell, but heat generated when power generation is performed in the fuel cell in addition to the fuel cell in the fuel cell system. This is a concept that includes heat generation if there is a part where the above occurs. For example, when the reformer is equipped with a burner, the heat generated by the burner and the heat generated in the shift reactor or the selective oxidation reactor can be included. Water can be heated by utilizing at least one of heat generation in the fuel cell and heat generation in other portions, and the hot water storage tank can store the warm water thus heated.

(High temperature part)
A fuel cell system that obtains hot water using heat generated by power generation of a fuel cell has a portion (hereinafter, sometimes referred to as a high-temperature portion) that can reach a temperature higher than the maximum hot water storage temperature during operation.

  For example, when the fuel cell system is operated, the high temperature part is a pipe through which a fluid having a temperature higher than the hot water storage maximum temperature flows (hereinafter, referred to as a high temperature pipe), a device that is higher than the hot water maximum temperature, or a temperature higher than the hot water maximum temperature. Can be cited as an example of a device (hereinafter, referred to as a high temperature device).

  Examples of the high-temperature pipe include a fuel cell exhaust gas channel that is a channel through which exhaust gas discharged from the fuel cell (hereinafter referred to as fuel cell exhaust gas) flows; steam used to supply steam to the reformer Piping; reformed gas piping used to supply reformed gas to the cell stack (fuel cell); and combustion discharged from a combustor such as a burner used to heat the reformer or vaporizer Gas piping can be mentioned.

  An example of a high temperature device is a fuel cell. However, the operating temperature of PEFC is often about 80 ° C., and the fuel cell may not correspond to a high temperature device depending on the maximum hot water storage temperature. PAFC, MCFC and SOFC usually correspond to high temperature equipment.

  As an example of the high-temperature equipment, a hydrogen production apparatus that reforms a hydrocarbon-based fuel to produce a hydrogen-containing gas can be mentioned. Examples of the hydrogen production apparatus include a desulfurizer, a reformer, a shift reactor, and a selective oxidation reactor.

  As an example of high temperature equipment, a heat exchanger that performs heat exchange between hot water and fuel cell exhaust gas can be cited. The heat exchanger can include, for example, a flow path through which hot water flows and a fuel cell exhaust gas flow path, which are partitioned from the hot water storage area.

  As an example of the high-temperature equipment, a water vaporizer that vaporizes water by using heat of the fuel cell exhaust gas can be mentioned. This water vaporizer can include, for example, a water channel that is a channel through which water partitioned from the hot water storage region flows, and a fuel cell exhaust gas channel.

  As an example of the high-temperature equipment, there can be mentioned a heat generating means which is a means for generating heat, which is used for additionally cooking hot water. Examples of the heat generating means include a combustor such as a burner and an electric heater.

[Siege area]
At least a part of the high temperature portion of the fuel cell system is disposed in the surrounding region (region surrounded by the hot water storage region from at least two directions).

  Therefore, for example, at least a part of the above-described fuel cell, hydrogen production apparatus (for example, a reformer), a heat exchanger that performs heat exchange between hot water and the fuel cell exhaust gas, and water using the heat of the fuel cell exhaust gas. A vaporizer or the like for vaporization can be arranged in the surrounding area.

  Hereinafter, the form of the surrounding area will be described.

  In the form shown in FIG. 1, the surrounding area 1 is an area that is buried in the hot water storage area 2 a inside the hot water tank 2. The surrounding area 1 is surrounded by the hot water accommodation area 2a from all directions. For example, a fuel cell module (including a fuel cell as a high-temperature device) can be disposed in the surrounding region.

  In the form shown in FIG. 2, the surrounding area 1 has a rectangular parallelepiped shape and is surrounded by the hot water storage area 2a from four directions. The remaining two directions are not surrounded by the hot water storage area. For example, the hot water tank can be provided with a through hole having a square opening, and the fuel cell module can be disposed here.

  In this specification, “cuboid” is a concept including “cube”.

  In the form shown in FIG. 3, the surrounding region 1 has a rectangular parallelepiped shape and is surrounded by the hot water storage region 2 a from five directions. The remaining one direction is not surrounded by the hot water storage area. For example, a rectangular parallelepiped depression is provided in the hot water storage tank, and the fuel cell module can be disposed here.

  In the form shown in FIG. 4, the surrounding area 1 has a rectangular parallelepiped shape and is surrounded by the hot water accommodation area 2 a from two directions. The remaining four directions are not surrounded by the hot water storage area.

  1-4, although the surrounding area | region 1 was made into the rectangular parallelepiped shape, it is not the limitation. For example, the shape of the surrounding region is not particularly limited, such as a columnar shape or a shape of a part of the column.

  In the form shown in FIG. 5, the surrounding area 1 is a fan column (cross section is ¼ circle), and the curved surface (cylindrical surface) is surrounded by the hot water accommodation area 2a from multiple directions.

  A space between the surrounding area and the hot water storage area can be appropriately partitioned so that the hot water does not enter the surrounding area.

  The hot water storage tank can have an appropriate shape according to the shape and arrangement of elements constituting the fuel cell system, such as a fuel cell, a flow path through which various fluids flow, a power line, a signal line, and a heat insulating material.

  From the viewpoint of suppressing heat dissipation, it is preferable that the surrounding region in which the high-temperature part of the fuel cell system is disposed is disposed at a relatively high temperature position above the hot water tank. For example, when the surrounding region includes a solid oxide fuel cell module that operates at a high temperature, such an arrangement can reduce heat insulation around the module, which is relatively expensive. In addition, it is possible to reduce the flow rate of fuel supplied to maintain the temperature of the module and thereby improve the power generation efficiency.

  FIG. 6 schematically shows a cross section of one embodiment of the fuel cell system of the present invention. Here, the fuel cell is included in the fuel cell module 3. The fuel cell system also includes a hot water tank 2 that stores hot water heated by heat generated by the power generation of the fuel cell.

  The fuel cell module is a module in which at least a fuel cell is housed in a housing (module container). Known components of the fuel cell system and necessary piping and wiring are placed in the housing as needed, and the operating temperature. Depending on the conditions, etc., it can be stored appropriately.

  The hot water storage tank has a hot water storage area 2a which is an area for storing the hot water. Water is supplied to the hot water storage area 2a. This water is heated by the heat generated by the power generation of the fuel cell to become hot water. Hot water is discharged from the hot water storage area and supplied to the customer.

  The surrounding area is partitioned from the warm water accommodation area so that the warm water in the warm water accommodation area does not enter the inside of the enclosure area.

  The surrounding area is an area buried in the hot water storage area 2a. That is, the surrounding area is surrounded from all directions by the hot water accommodation area. The fuel cell module 3 is disposed in the surrounding area 1.

  As such a hot water tank structure, a so-called double structure in which an inner wall 2b for forming the surrounding region 1 is formed inside the outer wall 2c of the hot water tank can be adopted. The inner wall 2b can be fixed to the outer wall 2c using a support column as appropriate. A configuration in which the hot water storage tank is divided into a plurality of parts may be employed (this mode will be described later with reference to FIG. 7).

  At least a portion of the high temperature portion of the fuel cell system is disposed in the enclosed region.

  A flow path through which the exhaust gas discharged from the fuel cell circulates, that is, a fuel cell exhaust gas flow path 4 is provided through the hot water storage region. Thereby, the heat of the fuel cell exhaust gas can be recovered in the form of hot water. In the form shown in FIG. 6, the fuel cell exhaust gas flow path 4 is not formed by a single pipe, but is formed by a plurality of pipes (three in FIG. 6). By branching the fuel cell exhaust gas and flowing it through a plurality of pipes, the heat transfer area can be increased.

  Gas discharged from the anode or cathode of the fuel cell, that is, anode off-gas or cathode off-gas, may flow through the fuel cell exhaust gas flow path 4 without undergoing reaction or heat recovery, or any reaction or heat recovery may be performed. It may be washed away after passing. For example, a combustion gas obtained by burning a combustible component in the anode off gas using the cathode off gas may be flowed to the fuel cell exhaust gas flow path 4 after heat recovery from the combustion gas in some cases.

  Although illustration is omitted, in addition to the fuel cell exhaust gas flow path 4, a pipe for supplying fluid to the equipment arranged in the enclosed area, a pipe for discharging the fluid from the equipment arranged in the enclosed area, Piping and wiring necessary for operating equipment arranged in the surrounding area, such as electric wiring and signal wiring, are provided as appropriate.

  Another embodiment of the present invention will be described with reference to FIG. As shown in this figure, the hot water tank 2 can be manufactured by dividing it into a first part 2-1 and a second part 2-1. The first part 2-1 of the hot water tank has a first hot water storage area 2-1a, and the second part 2-2 of the hot water tank has a hot water storage area 2-2a. At least one of the two parts (the first part 2-1 in FIG. 2) is provided with a recess used as the surrounding region 1. By surrounding this one part and the other part (the second part 2-2 in FIG. 2) with the depression inside, the surrounding area 1 is surrounded by the hot water storage areas 2-1a and 2-2a. Can be obtained. The hot water can be circulated by appropriately communicating between these two hot water storage areas.

  Still another embodiment of the present invention will be described with reference to FIG. Generally, heat exchange is performed between fuel cell exhaust gas and hot water supply water using a heat exchanger. As shown in this figure, the heat exchanger and the hot water tank can be integrated. Alternatively, this heat exchanger can be arranged separately from the hot water tank in the gap between the hot water tanks. That is, the heat exchanger can be arranged at a position in the hot water storage area that is separated from the wall of the hot water tank. In any of these cases, there is little space restriction and it is easy to secure the heat transfer area of the heat exchanger, so that the heat exchanger structure can be simplified and the cost can be reduced.

  Specifically, separately from the fuel cell exhaust gas flow path 4, a flow path 6 (hereinafter, referred to as a hot water flow path) through which hot water flows is provided, which is partitioned from the hot water storage area 2a. The hot water circulation channel 6 and the fuel cell exhaust gas channel 4 are adjacent to each other, and heat exchange is performed between the hot water flowing through the hot water circulation channel 6 and the fuel cell exhaust gas flowing through the fuel cell exhaust gas channel 4, Heat recovery from the battery exhaust gas is performed. For example, a pipe forming the fuel cell exhaust gas flow path 4 can be surrounded by a pipe 5 having a larger diameter to constitute a shell and tube type heat exchanger 7. The pipe 5 forms a shell of a shell and tube type heat exchanger. The hot water circulation channel 6 is supplied with the water in the hot water storage area 2 a after being pressurized by the pump 8. The hot water circulation channel 6 does not communicate with the inside of the surrounding region 1, and the hot water after heat recovery of the fuel cell exhaust gas is returned from the hot water circulation channel 6 to the hot water storage region 2 a. The hot water circulation channel 6 communicates with the hot water storage region 2a at the entrance and the exit thereof. Except for the entrance and the exit, the hot water circulation channel 6 does not communicate with the hot water storage region 2a. Note that the entrance of the flow path 6 communicates with the hot water storage region 2 a via the pump 8.

  The heat exchanger 7 is located inside the hot water storage area. The peripheral surface of this heat exchanger, that is, the periphery of the pipe 5 is surrounded by the hot water storage area. On the other hand, the bottom surface of the heat exchanger is not surrounded by the hot water storage area. That is, this heat exchanger does not need to be buried in the hot water storage area.

  In the above embodiment, the shell and tube type heat exchanger is used, but not limited thereto, an appropriate type of heat exchanger such as a plate fin type can be used. In the above embodiment, warm water flows on the shell side and fuel cell exhaust gas flows on the tube side. In addition, when the heat exchanger is disposed in the hot water storage area at a position separated from the wall of the hot water tank, a heat insulating material may be disposed between the wall of the hot water tank and the heat exchanger as necessary. it can.

  Still another embodiment of the present invention will be described with reference to FIG. This configuration can be used when a water vaporizer that generates heat vapor by exchanging heat between the fuel cell exhaust gas and water is used. According to this embodiment, since there is little space restriction and it is easy to secure the heat transfer area, the structure of the water vaporizer can be simplified and the cost can be reduced.

  Specifically, the form shown in FIG. 9 has a structure in which the shell side of the heat exchanger 7 in the form shown in FIG. The lower part of the partition plate 9, that is, the downstream part in the fuel cell exhaust gas flow direction, is used as a heat exchanger 7 for exchanging heat between the fuel cell exhaust gas and hot water. The upper part of the partition plate 9, that is, the part upstream of the fuel cell exhaust gas flow direction is used as the water vaporizer 10. Water supplied separately from the hot water is supplied to the shell side of the water vaporizer 10, and this water is heated by the fuel cell exhaust gas to generate water vapor. Here, the fuel cell module 3 includes a reformer (not shown) that produces a hydrogen-containing gas from a hydrocarbon-based fuel, and water vapor supplied to the reformer is generated by the water vaporizer 10. That is, the reforming water is boosted by the pump 11 separately from the hot water and supplied to the shell side of the water vaporizer 10, and the water vapor generated by the water vaporizer is supplied to the fuel cell module 3 through an appropriate pipe.

  In the said form, although a water vaporizer is comprised by partitioning a heat exchanger with a partition plate, it is not restricted to this, This water vaporizer can be distribute | arranged and spaced apart from a heat exchanger.

  Still another embodiment of the present invention will be described with reference to FIGS. This form uses heating means used for heating the water vaporizer and hot water (hot water) in addition to the form of FIG. According to this embodiment, the water vaporizer can be heated and the hot water can be reheated with a single heat generating means, so that compactness and cost reduction can be achieved. Moreover, since heat radiation to the environment of the heat generating means is reduced, it is possible to improve the thermal efficiency. As the heat generating means, a suitable one such as a burner or an electric heater is used.

  Specifically, in the form shown in FIG. 10, a burner 12 is arranged as a heat generating means above the water vaporizer 10 of the form shown in FIG. 9, and the fuel and air for the burner are the fuel pump 13 and the air, respectively. It is supplied via the blower 14. The burner exhaust gas and the fuel cell exhaust gas are mixed and supplied to the water vaporizer 10 and the heat exchanger 7. In FIG. 10, the burner exhaust gas and the fuel cell exhaust gas are mixed and supplied to the water vaporizer 10 and the heat exchanger 7, but can be separately supplied to the water vaporizer 10 and the heat exchanger 7. The water in the hot water storage area 2 a flows through the pipe 17 through the coiled pipe 16 disposed in the vicinity of the burner 12, is heated here, and is supplied to the customer through the pipe 18. When performing additional cooking, the heat output of the burner 12 is increased, and water is heated when circulating through the coiled piping. In FIG. 10, the burner is disposed above the water vaporizer, but is not limited thereto, and can be disposed in an appropriate place such as the inside or the periphery of the water vaporizer (including the top and bottom of the water vaporizer). In FIG. 10, the coiled pipe is used. However, the present invention is not limited to this, and the shell and tube that can heat the hot water supplied from the hot water storage area by heat exchange with the heat generated by the heat generating means. An appropriate type of heat exchange structure such as a mold or a plate fin mold can be used.

  In the form shown in FIG. 11, unlike FIG. 10, an electric heater 15 is arranged on the side surface of the water vaporizer 10 as a heating means, and a coiled pipe is arranged in the vicinity of the electric heater 15. In FIG. 11, the electric heater is disposed on the side surface of the water vaporizer, but is not limited thereto, and is disposed in an appropriate place such as the inside or the periphery of the water vaporizer (including the side surface and upper and lower surfaces of the water vaporizer). be able to.

  10 and FIG. 11, the water flow paths upstream and downstream of the heat generating means (the pipe 17 for supplying water to the coiled pipe and the pipe 18 for discharging water from the coiled pipe) are provided at the upper part of the hot water storage tank. It is desirable from the viewpoint of thermal efficiency that the surface area should be as small as possible by arranging it at a relatively high temperature.

  By disposing at least a part of the high temperature part of the fuel cell system in the surrounding area, particularly preferably by disposing the surrounding area in the hot water storage area, heat dissipation from relatively hot equipment and piping It can be recovered by water, and heat loss from these devices and pipes to the outside can be greatly suppressed.

[Hydrocarbon fuel]
As the hydrocarbon-based fuel, it is used by appropriately selecting from a compound or mixture thereof containing carbon and hydrogen (may contain other elements such as oxygen) known in the field of fuel cell systems as a raw material for reformed gas. In addition, compounds having carbon and hydrogen in the molecule such as hydrocarbons and alcohols can be used. For example, hydrocarbon fuels such as methane, ethane, propane, butane, natural gas, LPG (liquefied petroleum gas), city gas, gasoline, naphtha, kerosene, light oil, etc., alcohols such as methanol and ethanol, ethers such as dimethyl ether, etc. is there.

  Of these, kerosene and LPG are preferred because they are readily available. Moreover, since it can be stored independently, it is useful in areas where city gas lines are not widespread. Furthermore, a fuel cell system using kerosene or LPG is useful as an emergency power source. In particular, kerosene is preferable because it is easy to handle.

  The fuel cell system of the present invention can be used as, for example, a household cogeneration system.

DESCRIPTION OF SYMBOLS 1 Surrounding area 2 Hot water storage tank 2a Hot water storage area 2b Hot water tank inner wall 2c Hot water tank outer wall 3 Fuel cell module 4 Fuel cell exhaust gas flow path 5 Heat exchanger outer wall 6 Hot water flow path 7 Heat exchanger 8 Pump 9 Partition plate 10 Water vaporizer DESCRIPTION OF SYMBOLS 11 Pump 12 Burner 13 Burner fuel pump 14 Burner air blower 15 Electric heater 16 Coiled piping 17 Piping for supplying water to the coiled piping 18 Piping for discharging water from the coiled piping

Claims (6)

A fuel cell system comprising at least a fuel cell and a hot water storage tank for storing hot water heated by heat generated by power generation of the fuel cell,
The hot water storage tank has a hot water storage area that is an area for storing the hot water,
The fuel cell system, at least some of the portions can be a higher temperature than the hot water storage maximum temperature during operation, it is arranged in a region surrounded by at least two directions to the hot water receiving region, and,
A fuel cell is disposed in a region surrounded by the hot water storage region from at least two directions; and
The fuel cell system includes a hydrogen production apparatus that reforms a hydrocarbon fuel to produce a hydrogen-containing gas,
At least a part of the hydrogen production device is disposed in a region surrounded by the hot water storage region from at least two directions, and
A fuel cell exhaust gas channel, which is a channel through which exhaust gas discharged from the fuel cell circulates, is disposed in a region surrounded by the hot water storage region from at least two directions; and
A heat exchanger for exchanging heat between the hot water and the fuel cell exhaust gas, comprising the partitioned hot water flow path and the fuel cell exhaust gas flow path, wherein the hot water storage area is the hot water storage Arranged in an area surrounded by the area from at least two directions, and
A water vaporizer that vaporizes water flowing through the water flow path, including a water flow path that is a flow path through which partitioned water flows and the fuel cell exhaust gas flow path, is provided in the hot water storage area. Arranged in the area surrounded from two directions, and
The fuel cell system, wherein the heat exchanger and the water vaporizer are formed by dividing a low-temperature fluid side flow path of one heat exchanger into two by a partition plate . The heat exchanger and the water vaporizer were formed by dividing the shell side of one shell and tube type heat exchanger into two by a partition plate,
The fuel cell system according to claim 1. 3. The fuel cell system according to claim 1, wherein the water vaporizer and heat generating means for heating the hot water are disposed in a region surrounded by the hot water storage region from at least two directions. A heat exchange structure capable of heating the hot water supplied from the hot water storage area by heat exchange with the heat generated by the heat generating means; and
  A pipe for discharging the hot water heated by the heat exchange structure to the outside of the fuel cell system;
The fuel cell system according to claim 3. The region surrounded by at least two directions in the hot water storage region includes a region buried in the hot water storage region,
The fuel cell system according to any one of claims 1 to 4 . The fuel cell, the fuel cell system of any one of claims 1 to 5 is a solid oxide fuel cell.

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