JP2003214712A - Fuel cell cogeneration system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems wherein a conventional fuel cell cogeneration system has poor field installation performance and thermal efficiency. <P>SOLUTION: A fuel cell cogeneration system comprises a fuel cell system 17 having a fuel supplying means 21 and a fuel cell 11, a hot water storage tank 31, stored hot water piping 33, heat exchanging means 13 and 42, and an outer case 53 for storing the fuel cell system 17, the hot water storage tank 31, the stored hot water piping 33 and the heat exchanging means 13 and 42. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell cogeneration system for generating power and supplying heat using a fuel cell.

[0002]

2. Description of the Related Art A general hot water recovery type fuel cell cogeneration system is shown in FIG. The fuel cell 11 is
Hydrogen-rich gas supplied (hereinafter referred to as fuel gas)
Electricity and heat are generated by the reaction between the gas and an oxidant gas such as air. The fuel gas is generated in the fuel processor 21 by heating a raw material such as natural gas in an atmosphere containing water vapor, and is introduced into the fuel line 15 of the fuel cell 11. Air is supplied to the air line 15 of the fuel cell 11 by the air supply device 41. The air discharged from the fuel cell 11 is introduced into the air condenser 42 to condense and separate water.

Cooling water is circulated in the fuel cell 11 by a cooling water circulation pump 12 in order to remove heat generated during power generation and maintain the fuel cell 11 at a predetermined temperature.
The cooling water that has passed through the fuel cell 11 is cooled by the cooling water radiator 13 and exchanges heat with the stored hot water stored in the hot water storage tank 31.

In the hot water storage tank 31, hot water near the bottom surface is sucked by the hot water circulation pump 32, and heat is recovered by the hot water piping 33 via the air condenser 42 and the cooling water radiator 13. It returns to the vicinity of the upper surface of the hot water tank 31. When the hot water storage tank 31 is vertically long as shown in FIG. 4, such a laminated boiling system (for example, described in JP 2000-340244 A).
Is adopted.

In a conventional hot water recovery type fuel cell cogeneration system, as shown in FIG. 4, a tank exterior case 52 accommodating a hot water storage tank 31 and a fuel cell 11 and a cooling water radiator 13 are accommodated. It was installed separately from the system exterior case 51, and the system exterior case 51 and the tank exterior case 52 were pipe-connected at the site via the pipe connection means 34.

[0006]

However, in the fuel cell cogeneration system as described above, the system outer case 51 and the hot water tank 52 must be arranged separately and the pipe connection work must be performed on site. There was a problem in construction at the site that it was time-consuming and wasted installation space. Further, there is a problem that the extension of the pipe between the system outer case 51 and the hot water storage tank 52 increases heat dissipation and pressure loss, and reduces the efficiency of the fuel cell cogeneration system.

In view of the problems that the above-mentioned conventional fuel cell cogeneration system takes time and labor and that the heat dissipation and the pressure loss are large and the efficiency is low, the present invention requires no time and effort for the work. , Or
An object of the present invention is to provide a fuel cell cogeneration system that has low heat dissipation and pressure loss and high efficiency.

[0008]

In order to solve the above problems, a first aspect of the present invention (corresponding to claim 1) provides a fuel supply means for supplying a fuel gas and a fuel supply means from the fuel supply means. A fuel cell system having a fuel cell for receiving;
A hot water tank for storing hot water, a hot water pipe connected to the hot water tank, a heat exchange means connected to the fuel cell system and the hot water pipe, the fuel cell system, the hot water tank, It is a fuel cell cogeneration system provided with the hot water storage pipe and an exterior case for housing the heat exchange means.

In a second aspect of the present invention (corresponding to claim 2), there are a plurality of the heat exchanging means, and the plurality of heat exchanging means are connected in series to the hot water storage pipe, and the hot water storage tank is provided along the hot water storage tank. 1 is a fuel cell cogeneration system according to a first aspect of the present invention arranged substantially vertically.

In a third aspect of the present invention (corresponding to claim 3), the hot water storage tank is arranged such that its longitudinal direction is vertical, and one end of the hot water storage pipe takes out the hot water. The fuel cell cogeneration system according to the second aspect of the present invention, which is connected to a lower portion of the hot water storage tank, and the other end of the hot water storage water pipe is connected to an upper portion of the hot water storage tank for returning the hot water storage. .

In a fourth aspect of the present invention (corresponding to claim 4), the plurality of heat exchanging means are sequentially arranged from the upstream side to the downstream side of the hot water storage pipe in the ascending order of the fluid temperature on the heat recovery side. The fuel cell cogeneration system according to the third aspect of the present invention.

In a fifth aspect of the present invention (corresponding to claim 5), the plurality of heat exchanging means are sequentially arranged from the upstream side to the downstream side of the hot water storage pipe in the ascending order of the fluid temperature on the heat recovery side. The fuel cell cogeneration system according to the third aspect of the present invention.

In a sixth aspect of the present invention (corresponding to claim 6), the plurality of heat exchange means are first and second heat exchange means, and the fuel cell includes a cooling water line and an oxidant gas line. An outlet of the cooling water line is taken out from an upper portion of the fuel cell and connected to the first heat exchange means, and an outlet of the oxidant gas line is taken out from a lower portion of the fuel cell to be the second Connected to the heat exchange means of
The fuel cell cogeneration system according to the fourth or fifth aspect of the present invention, wherein the height of the fuel cell is intermediate between the height of the first heat exchange means and the height of the second heat exchange means. System.

A seventh aspect of the present invention (corresponding to claim 7) is a fuel cell cogeneration system, which comprises a pipe connecting means for dividing an outer case into a plurality of modules and connecting the divided pipes to the plurality of modules. System.

A first invention related to the present invention is provided with a heat insulating means for keeping the hot water storage tank warm, and the heat exchange means is kept warm by the heat insulating means. It is a cogeneration system.

A second invention relating to the present invention is a fuel cell system having a fuel supply means for supplying a fuel gas and a fuel cell for receiving fuel supply from the fuel supply means, and a hot water tank for storing hot water. The method is to integrally store the hot water storage pipe connected to the hot water storage tank, and the heat exchange means connected to the fuel cell system and the hot water storage pipe in an exterior case and install it on site.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. (Embodiment 1) FIG. 1 is a schematic diagram showing the structure of a fuel cell cogeneration system according to Embodiment 1 of the present invention, and the structure and manufacturing method will be described based on this drawing. The fuel cell cogeneration system according to the first embodiment of the present invention has a configuration in which a vertically long hot water storage tank 31 is housed in a vertically long (that is, vertically long) outer case 53. As the material of the hot water storage tank 31, for example, resin or stainless steel that does not deform or corrode when it is stored is used.
A return port 37 is provided at the top of the hot water storage tank 31, and an intake port 36 is provided at the lower part of the hot water storage tank 31. Further, to the hot water storage tank 31, a water supply means (not shown) for supplying water from the outside and a hot water pipe (not shown) for supplying hot water to the outside are connected.

The cooling water radiator 13, which is the first heat exchanging means of the present invention, has a primary side, which is the heat recovery side, and a secondary side, which is the heat recovery side. The next side has an inlet and an outlet, respectively. In the return port 37,
One end of the hot water storage pipe 33 is connected to the hot water storage pipe 33.
Is connected to the outlet on the secondary side of the cooling water radiator 13.

The air condenser 42 which is the second heat exchanging means of the present invention has a primary side which is a heat recovery side and a secondary side which is a heat recovery side, and these primary side and secondary side. The sides each have an inlet and an outlet. This air condenser 42
One end of a hot water storage pipe 33 is connected to the outlet on the secondary side of the cooling water radiator 13 at the other end.
The secondary inlet of is connected.

Then, one end of the hot water storage pipe 33 is connected to the inlet on the secondary side of the air condenser 42, and the other end of the hot water storage pipe 33 has an outlet and an outlet of the hot water circulation pump 32 having an inlet and an outlet. Are connected. Then, one end of a hot water storage pipe 33 is connected to an inlet of the hot water circulation pump 32, and the other end of the hot water storage pipe 33 is connected to an intake port 36 of the hot water storage tank 53.

According to the arrangement of the heat exchange means described above, the air condenser 42 is connected to the upstream side of the hot water storage pipe 33, and the cooling water radiator 13 is connected to the downstream side of the hot water storage pipe.
The air condenser 42 and the cooling water radiator 13 are connected in series.

Here, the cooling water radiator 13 may be a plate heat exchanger, and the air condenser 42 may be a fin tube heat exchanger, but other types may be used.

The hot water storage pipes 33 are arranged close to each other along the hot water storage tank 31. Further, the air condenser 42 and the cooling water radiator 13 are arranged along the hot water storage tank 31.
It is arranged substantially vertically. That is, the air condenser 42 connected to the upstream side of the hot water storage pipe 33 is located below the inside of the outer case 53 so that the hot water storage tank 31 is provided.
The cooling water radiator 13, which is arranged in close proximity to the hot water storage pipe 33 and is connected to the downstream side of the hot water storage pipe 33, is arranged close to the hot water storage tank 31 so as to be located above the interior case 53. In other words, the air condenser 42 and the cooling water radiator 13 are inserted and arranged along the shortest path of the hot water storage pipe 33 taken out of the hot water storage tank 31 to the return port 37.

Here, the air condenser 42 and the cooling water radiator 13 may be supported by the stored hot water pipe 33 itself, or may be attached by a bracket provided inside the case exterior 53. Alternatively, a frame is provided on the floor surface of the outer case 53, and the air condenser 42 is attached to the frame.
And the cooling water radiator 13 may be installed. Alternatively, the air condenser 42 may be installed on the floor surface of the outer case 53, and the cooling water radiator 13 may be suspended from the ceiling of the outer case 53. In short, the air condenser 42 is connected to the upstream side of the hot water storage pipe 33 and is located below the inside of the outer case 53, and the cooling water radiator 13 is connected to the downstream side of the hot water storage pipe 33 and above the inside of the outer case 53. If so, the air condenser 42 and the cooling water radiator 13 may be attached by a method other than the above.

The fuel cell 11 has a cooling water line 14 having an inlet and an outlet, an air line 15 as an oxidant gas line having an inlet and an outlet, and a fuel line 16 having an inlet and an outlet. This cooling water line 1
One end of a cooling water pipe 38 is connected to the inlet of 4, and the outlet of the cooling water circulation pump 12 having an inlet and an outlet is connected to the other end of the cooling water line 14. One end of a cooling water pipe 38 is connected to the inlet of the cooling water circulation pump 12, and the other end of the cooling water pipe 38 is connected to the cooling water radiator 1.
3 primary outlets are connected.

One end of a cooling water pipe 38 is connected to the outlet of the cooling water line 14 of the fuel cell 11, and the other end of the cooling water pipe 38 is connected to the inlet on the primary side of the cooling water radiator. ing.

An air supply device 41 is connected to the inlet of the air line 15 of the fuel cell 11 via an air pipe 39. One end of an air pipe 39 is connected to the outlet of the air line 15, and the other end of the air pipe 39 is connected to the inlet on the primary side of the air condenser 42. Air condenser 4
One end of an air pipe 39 is connected to the outlet on the primary side of 2.

The fuel cell system 17 of the present invention has a heat treatment apparatus 21 which is a fuel supply means for supplying a fuel gas, and a fuel cell 11 which is supplied with fuel from the heat treatment apparatus 21. Then, one end of a fuel pipe 40 is connected to the inlet of the fuel line 16 of the fuel cell 11.
A fuel processor 21 is connected to the other end of the. A raw material gas pipe is connected to the fuel processor 21.

Here, the position of the fuel cell 11 is located midway between the height of the cooling water radiator 13 and the height of the air condenser 42. In addition, the cooling water line 14 of the fuel cell 11
The inlet and the outlet are installed in the upper part of the fuel cell 11, and the inlet and the outlet of the air line 15 are installed in the lower part of the fuel cell 11. In addition, the cooling water circulation pump 12 is connected to the inlet of the cooling water line 14 of the fuel cell 11 and the cooling water radiator 13.
It is installed on the upper part of the outer case 53 between the outlet on the primary side of the.

Next, the operation of the fuel cell cogeneration system according to the first embodiment of the present invention configured as described above will be described. A raw material such as natural gas is supplied to the fuel processing device 21 through the raw material gas pipe. In the fuel processing device 21, the raw material gas is heated and reformed in an atmosphere containing water vapor to generate a fuel gas containing hydrogen. The generated fuel gas is sent from the fuel processing device 21 to the fuel line 16 of the fuel cell 11 via the fuel pipe.

The fuel cell 11 is provided with the air supply device 4
Power generation is performed using the air as the oxidant gas, which is supplied by way of 1 through the air pipe 39. Although heat is generated at the time of power generation, the cooling water is circulated by the cooling water circulation pump 12 through the cooling water pipe 38 and the cooling water line 14 of the fuel cell 11, and the heat generated by the power generation is generated by the fuel cell. Remove from 11. At this time, the cooling water is the fuel cell 11
It gets hot to draw heat from it. Then, this high-temperature cooling water passes through the cooling water pipe 38 to exchange heat with the stored hot water in the cooling water radiator 13 to release heat.

The air taken into the fuel cell 11 for power generation rises in temperature due to the reaction of power generation in the fuel cell 11 and is discharged from the outlet of the air line 15 of the fuel cell 11 to the air pipe 39. To be done. Further, the air discharged to the air pipe 39 contains water vapor generated during power generation. The air containing the water vapor is supplied to the air condenser 42.
Heat is taken away by exchanging heat with the stored hot water,
The contained water is condensed. The condensed water and the air discharged from the air condenser 42 are discharged to the outside of the outer case 53 via the air pipe 39.

As the stored hot water, tap water or industrial water is used, for example, and is supplied to the stored hot water tank 31 using a water supply means. Hot water storage tank 3 by hot water circulation pump 32
The stored hot water is sucked from the intake port 36 of No. 1 through the stored hot water pipe 33, first enters the air condenser 42, and then recovers heat via the cooling water radiator 13. In this case, since the amount of heat exchanged in the cooling water radiator 13 is larger than the amount of heat exchanged in the air condenser 42, the amount of hot water stored in the cooling water radiator 13 is higher than that of the amount of hot water stored in the air condenser 42. The amount of temperature rise is larger. In this way, by arranging the heat exchange means from the upstream side of the stored hot water pipe in order of increasing heat exchange amount, the heat loss from the stored hot water pipe 33 can be minimized.

The reason for this is that by shortening the section through which the hot water is heated, the portion where the difference between the temperature of the hot water and the ambient temperature in the outer case 53 becomes large is reduced, and the heat radiation efficiency is reduced. Because you can.

The cooling water temperature, which is the fluid temperature on the primary side of the cooling water radiator 13, is higher than the air temperature, which is the fluid temperature on the primary side of the air condenser 42. Therefore, as described above, when the heat exchanging means is arranged from the upstream side to the downstream side of the hot water storage pipe in the ascending order of the primary side fluid temperature, the difference between the primary side fluid temperature and the hot water storage temperature should be large. The amount of heat can be recovered more efficiently.

Further, the hot water storage pipe 33, the air condenser 42,
Since the cooling water radiator 13 is arranged close to the hot water storage tank 31, a part of the heat radiation from the hot water storage pipe 33, the air condenser 42, and the cooling water radiator 13 is part of the hot water storage tank 31.
The heat loss can be minimized.

Further, since the longitudinal direction of the hot water storage tank 31 is arranged vertically, the temperature of the hot water stored in the hot water storage tank 31 is high at the upper portion thereof. At this time, the stored hot water having a low temperature exists at the bottom of the stored hot water tank 31, but is drawn from the water intake 36 by the stored hot water circulation pump 32 and passes through the air condenser 42 and the cooling water radiator 13 to raise the temperature. The return port 3 of the hot water tank 31
Returned to 7. The hot water that has been heated is accumulated and accumulated from the upper portion of the hot water, and can be taken out according to the demand for hot water from the outside by an external pipe connected to the hot water tank 31.

As described above, the temperature raising method of boiling the stored hot water from the upper portion is different from the method of boiling all the stored hot water.
High-temperature hot water can be taken out from the upper part of the tank in a short time, and even if there is a change in hot water load, it can be immediately dealt with.

According to the configuration of the fuel cell cogeneration system of the first embodiment, the fuel cell, the fuel processing device, the cooling water radiator, the air condenser, the hot water storage tank 31, the hot water storage pipe 33, and the like are the same. Outer case 5
Since it can be collectively stored in the factory at 3, the hot water storage tank pipes between the system outer case 51 and the tank outer case 52, which are conventionally required when installing on-site, are required. Since the connection work by 33 is unnecessary, the process of installation work on site is shortened and the workability is improved.

In addition, according to the fuel cell cogeneration system of the first embodiment, the system exterior case 5
It is also possible to reduce the installation area as compared with the fuel cell cogeneration system in which the 1 and the tank exterior case 52 have different configurations. Since the horizontal pipe extension can be greatly reduced from the conventional fuel cell cogeneration system shown in FIG. 4, the route of the hot water storage pipe 33 via each heat exchange means can be greatly shortened. . As a result, it is possible to reduce heat loss and pressure loss due to heat radiation in the hot water storage pipe 33 and improve the efficiency of the entire fuel cell cogeneration system.

Furthermore, according to the method of installing the fuel cell cogeneration system of the first embodiment on-site,
Since the components such as the fuel cell 11, the hot water storage tank 31, and the hot water storage pipe 33 are manufactured so as to be integrally stored in the same outer case 53 at the factory, the outer case for the hot water storage tank is formed. It is possible to provide a low-cost fuel cell cogeneration system that does not need to be separately prepared, can be easily installed on the site, and is inexpensive.

(Embodiment 2) FIG. 2 is a schematic diagram showing the structure of a fuel cell cogeneration system according to Embodiment 2 of the present invention. In FIG. 2, components common to those of the first embodiment of the present invention are designated by the same reference numerals,
In the following description, only components different from those of the first embodiment of the present invention will be described.

In the fuel cell cogeneration system shown in FIG. 2, the hot water storage tank 31, the cooling water radiator 13 which is the heat exchanging means, and the air condenser 42 in the fuel cell cogeneration system according to the first embodiment of the present invention are provided. A common heat insulating material 34 (an example of the heat insulating material is glass wool, etc.) is integrally covered.

With this structure, the heat radiated from the heat exchanging means such as the cooling water radiator 13 can be effectively absorbed in the hot water tank 31.
The heat recovery efficiency of the fuel cell cogeneration system can be improved. Also, compared with the case where the heat exchanging means is individually covered with the heat insulating material, the surface to be covered with the heat insulating material is smaller, which reduces the total amount of the heat insulating material used and contributes to the cost reduction of the fuel cell cogeneration system. You can also

FIG. 3 is a schematic diagram showing the structure of a fuel cell cogeneration system of the present invention which is a modification of the first embodiment. In FIG. 3, the same components as those of the first or second embodiment of the present invention are denoted by the same reference numerals, and in the following description, only the components different from the components described above will be described. .

A feature of the fuel cell cogeneration system shown in FIG. 3 is that a separating plate 54 is provided in the outer case 53 of the fuel cell cogeneration system described above. That is, in the outer case 53, the separation plate 54 is provided so as to separate the space including the hot water storage tank 31, the hot water storage pipe 33, the air condenser 42, the cooling water radiator 13, and the hot water circulation pump 32 from other elements. Are arranged in the vertical direction, and the separating plate 54 is arranged in the horizontal direction so as to divide the space containing the fuel cell 11 and the cooling water circulation pump 12.

The separation plate 54 has a pipe connecting device 35.
As such, a flange and a coupler are provided. By arranging the separating plate 54 in this way, the inside of the outer case 53 of the fuel cell cogeneration system is divided into three modules.

According to the fuel cell cogeneration system having such a configuration, each module can be individually taken out by removing the pipe in each module from the pipe connecting device 35, and maintenance and repair can be easily performed. It becomes possible to do it. Further, it can be easily transported and installed. In addition, it is possible to easily change the performance and specifications by replacing each module.

Although the separating plate 54 is used in the above example, a separating casing may be used. That is, the fuel cell 11 and the cooling water circulation pump 1
A member including 2 is accommodated in one casing as one module, and a member including the hot water tank 31, the cooling water radiator 13, the air condenser 42, and the hot water circulating pump 32 is accommodated in another casing. The member including the fuel processing device 21 and the air supply device 41 is further another one.
It may be housed in one casing. Each casing has a flange, a coupler, etc. as the pipe connecting device 35. Such casings are arranged in the outer case 53 so that at least two casings are adjacent to each other. The casings may be connected to each other by bolts or the like using flanges installed in the casings.

At this time, at least one surface of each casing may be open or an opening / closing door may be installed for easy maintenance.

In addition, the above module is used in the outer case 5
Although 3 has been described as being divided into three, it may be divided into two or may be divided into four or more.

Although the outer case 53 and the hot water storage tank 31 have the vertically long shape in the above description through the first and second embodiments, they may have the horizontally long shape or the same vertical and horizontal dimensions. That is, it may have any shape as long as the hot water storage tank 31 is stored in the outer case 53.

A return port 3 is provided at the top of the hot water tank 31.
7 has been described as a structure provided, the return port 37
Is not limited to the top, and may be provided near the top as long as it is above the hot water storage tank 31.

Further, as the fuel gas of the fuel cell 11, it has been explained that the raw material gas is introduced into the fuel processing device 21 as the fuel supply means and reformed to generate the fuel gas for use. A liquid fuel such as methanol may be introduced into. Alternatively, the fuel processor 2
Hydrogen may be directly supplied to the fuel line 16 of the fuel cell 11 without passing through 1.

Further, the configuration example using the air condenser 42 and the cooling water radiator 13 as the heat exchange means for recovering heat with the stored hot water has been described, but other configurations, for example, the constituent elements of the fuel cell system 17 are described. A heat exchanging means for recovering exhaust heat from a certain fuel processing device 21 or a heat exchanging means for recovering exhaust heat from fuel gas discharged from the fuel cell 11 may be added in series to the hot water storage pipe 33. And air condenser 42
Alternatively, the cooling water radiator 13 may be installed instead.

In this case, as described above, the hot water storage pipe 33 is connected in series from the upstream side of the hot water storage pipe 33 in the ascending order of heat exchange amount, or from the upstream side of the hot water storage pipe in the ascending order of fluid temperature on the heat recovery side. It is preferably connected in series, but not limited to this.

On the contrary to the above, it may be considered to recover the heat only from the cooling water radiator 13.

Further, in the above description, the inlet and outlet of the cooling water line 14 of the fuel cell 11 are installed in the upper part of the fuel cell, and the inlet and outlet of the air line 15 are installed in the lower part of the fuel cell 11. However, they may be installed on the side of the fuel cell 11 or in other arrangements.

In the above description, the cooling water radiator 13
Although the air condenser 42 and the air condenser 42 are described as being covered with the common heat insulating material 34, heat exchange means other than them, for example, a heat exchanger that recovers exhaust heat from the fuel processing device 21, or discharge from the fuel cell 11. A heat exchanger that recovers exhaust heat from the stored fuel gas may be connected to the hot water storage pipe 33 and may be integrally covered with the hot water storage tank 31 by the heat insulating material 34.

[0060]

As described above, according to the present invention, it is possible to provide a fuel cell cogeneration system in which the steps of installation work are shortened and the construction is labor-free.

Further, when a plurality of heat exchange means are connected in series to the hot water storage pipe and arranged substantially vertically along the hot water storage tank, the installation space of the fuel cell cogeneration system is reduced. be able to.

Further, the longitudinal direction of the hot water storage tank is set to the vertical direction, and the hot water storage is taken out from the lower portion of the hot water storage tank.
When the stored hot water is returned to the upper part of the stored hot water tank, heat loss and pressure loss from the stored hot water pipe can be reduced.

Further, when the plurality of heat exchange means are arranged from the upstream side to the downstream side of the hot water storage pipe in the ascending order of heat exchange amount, the heat loss from the hot water storage pipe can be further reduced.

When the heat exchanging means is arranged from the upstream side to the downstream side of the stored hot water pipe in the ascending order of the fluid temperature of the recovered heat quantity, the heat loss from the stored hot water pipe can be further reduced. it can.

Further, the cooling water line is taken out from the upper part of the fuel cell and connected to the first heat exchange means, and the oxidant gas line is taken out from the lower part of the fuel cell and connected to the second heat exchange means. In this case, the heat loss and pressure loss of the fuel cell cogeneration system can be further reduced.

Further, when the outer case is divided into a plurality of modules and the pipe connecting means for connecting the divided pipes to the plurality of modules is provided, the process of installation work is shortened and the fuel cell is easy to install. A cogeneration system can be provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a fuel cell cogeneration system according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a fuel cell cogeneration system according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram showing a configuration of a fuel cell cogeneration system that is a modification of the first embodiment of the present invention.

FIG. 4 is a schematic diagram showing a configuration of a conventional fuel cell cogeneration system.

[Explanation of symbols]

11 Fuel cell 12 Cooling water circulation pump 13 Cooling water radiator 17 Fuel cell system 21 Fuel processor 31 Hot water storage tank 32 Hot water circulation pump 33 Hot water storage pipe 36 Intake 37 Roundabout 41 Air supply device 42 Air condenser 53 exterior case

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Terumaru Harada             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Masao Yamamoto             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Tetsuya Ueda             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 3L037 AA01 AB01

Claims (7)

[Claims] 1. A fuel cell system having a fuel supply means for supplying a fuel gas and a fuel cell for receiving fuel from the fuel supply means, a hot water tank for storing hot water, and a hot water tank connected to the hot water tank. A hot water storage pipe, a heat exchange means connected to the fuel cell system and the hot water storage pipe, and an outer case for housing the fuel cell system, the hot water storage tank, the hot water storage pipe and the heat exchange means. Fuel cell cogeneration system. 2. A plurality of the heat exchanging means, the plurality of heat exchanging means being connected in series to the hot water storage pipe and arranged substantially vertically along the hot water storage tank. Item 1. A fuel cell cogeneration system according to item 1. 3. The hot water storage tank is arranged such that its longitudinal direction is vertical, and one end of the hot water storage pipe is connected to a lower portion of the hot water storage tank to take out the hot water storage. The fuel cell cogeneration system according to claim 2, wherein the other end of the water pipe is connected to an upper portion of the hot water storage tank for returning the hot water storage. 4. The fuel cell cogeneration system according to claim 3, wherein the plurality of heat exchange means are sequentially arranged from the upstream side to the downstream side of the hot water storage pipe in the order of small heat exchange amount. 5. The fuel cell according to claim 3, wherein the plurality of heat exchanging means are sequentially arranged from the upstream side to the downstream side of the hot water storage pipe in the ascending order of the fluid temperature on the heat recovery side. Cogeneration system. 6. The plurality of heat exchange means are first and second heat exchange means, the fuel cell includes a cooling water line and an oxidant gas line, and an outlet of the cooling water line is the fuel cell. Is connected to the first heat exchange means, and the outlet of the oxidant gas line is
The fuel cell is taken out from the lower portion of the fuel cell and connected to the second heat exchange means, and the height of the fuel cell is the height of the first heat exchange means and the height of the second heat exchange means. The fuel cell cogeneration system according to claim 4 or 5, which is located in the middle. 7. A fuel cell cogeneration system comprising a pipe connecting means for dividing an outer case into a plurality of modules and connecting the divided pipes to the plurality of modules.