JP2005032461A - Fuel cell cogeneration system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell cogeneration system capable of reducing the cost, by reducing the installation space by making the installation work at an installation field more simple. <P>SOLUTION: The fuel cell cogeneration system includes a fuel cell power generation system 2, containing a fuel cell body 12 for generating dc power with an electrochemical reaction with a fuel gas and an oxidant gas; a power conversion system 3 containing a DC/AC inverter 21 for converting the generated dc power into ac power; a hot-water supply system 4 constituted by including a hot-water storage tank 31, heat-accumulating exhaust heat recovered at least from either the fuel cell power generation system or power conversion system as warm water, and supplies the accumulated hot water; and a common base plate 7 where either all or a part of the fuel cell power generation system or all or a part of the power conversion system is fixed and the hot-water storage tank is fixed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel cell cogeneration system that generates electric power and heat.
[0002]
[Prior art]
FIG. 4 is a front view of a conventional fuel cell cogeneration system 301 for home use. As shown in the figure, a fuel cell cogeneration system 301 includes a reformer 311, a fuel cell main body 312, a DC / DC converter 313, an auxiliary device unit 314, and a control panel 305. (FIG. 4 (B)), a hot water storage tank unit 304 (FIG. 4 (A)) including a hot water storage tank 331 and a cooking device 332, and a DC / AC inverter unit 303 (FIG. 4) including a DC / AC inverter 321. (C)).
[0003]
The fuel cell power generation unit 302, the hot water tank unit 304, and the DC / AC inverter unit 303 are housed in the housings 306B, 306A, and 306C, respectively, and the housings 306B, 306A, and 306C are each in the bases 307B and 307A. , 307C. In the figure, the housings 306B, 306A, and 306C are shown with the front wall omitted.
The fuel cell cogeneration system 301 includes a fuel cell cooling device (not shown in FIG. 4) for cooling the fuel cell main body 312 and an exhaust heat recovery device (not shown in FIG. 4) for recovering exhaust heat from the fuel cell main body 312 and the like. As shown).
[0004]
[Problems to be solved by the invention]
However, in such a conventional fuel cell cogeneration system 301, the fuel cell power generation unit 302, the hot water tank unit 304, and the DC / AC inverter unit 303 require housings 306B, 306A, 306C, and bases 307B, 307A, 307C, respectively. It becomes a drag on cost reduction.
[0005]
Moreover, it is necessary to perform installation work for each of the fuel cell power generation unit 302, the hot water tank unit 304, and the DC / AC inverter unit 303, and in order to install each unit independently, on-site wiring work connecting the units. Local piping work becomes necessary, and the local construction becomes complicated. Installation space is also required for each unit, and a large installation space is required.
[0006]
In addition, when the fuel cell cooling device and the exhaust heat recovery device are configured in the same system, piping for connecting the fuel cell power generation unit 302 and the hot water tank unit 304 will be on-site work. When a special liquid such as pure water is used as a medium, the work that requires special consideration is local work, and the local work becomes complicated.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel cell cogeneration system capable of simplifying on-site construction at an installation site, reducing the installation space, and reducing the cost.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a fuel cell cogeneration system 1 according to the first aspect of the present invention is a fuel that generates DC power by an electrochemical reaction between a fuel gas and an oxidant gas, for example, as shown in FIG. A fuel cell power generation system 2 including a battery body 12; a power conversion system 3 including a DC / AC inverter 21 for converting the generated DC power into AC power; and a fuel cell power generation system 2 And a hot water supply system 4 that includes a hot water storage tank 31 that stores exhaust heat recovered from at least one of the power conversion systems 3 as hot water, and supplies hot water of the stored hot water; and all or one of the fuel cell power generation system 2 And a common base plate 7 to which at least one of the power conversion system 3 and all or part of the power conversion system 3 and the hot water storage tank 31 are fixed. .
[0009]
If comprised in this way, since the common base plate 7 is provided, at least any one of all or part of the fuel cell power generation system 2 fixed to the common base plate 7 and all or part of the power conversion system 3 is provided. And since it is not necessary to perform piping work between the hot water tank 31 fixed on the common base plate 7 at the factory and at the installation site, the on-site construction at the installation site can be simplified. Furthermore, since the gap of the space around the hot water tank 31 can be reduced, the installation space can be reduced and the cost can be reduced.
[0010]
A fuel cell cogeneration system 1 according to a second aspect of the present invention is the fuel cell cogeneration system according to the first aspect. For example, as shown in FIG. In particular, all main component devices, substantially all main component devices of the power conversion system 3, and substantially all main component devices of the hot water supply system 4 are fixedly installed.
[0011]
If comprised in this way, the hot water storage tank 31, substantially all the main components of the fuel cell power generation system 2, substantially all the main components of the power conversion system 3, and substantially all of the hot water supply system 4 It is not necessary to perform piping work between the main component equipment at the factory and at the installation site, and the on-site construction at the installation site can be simplified, and the space around the hot water tank 31 can be made free. Since it can be reduced, the installation space can be further reduced and the cost can be further reduced. In addition, it is fixed to the common base plate 7 that it is fixed directly to the common base plate 7 or is fixed to the common base plate 7 (the common base 7). In the case of being indirectly fixed to the plate 7).
[0012]
A fuel cell cogeneration system 1 according to a third aspect of the present invention is the fuel cell cogeneration system according to the first or second aspect, wherein, for example, as shown in FIG. When fixed, the vertical projection plane on the common base plate 7 of the fuel cell main body 12 is close to the tank vertical projection plane so that it does not overlap the tank vertical projection plane on the common base plate 7 of the hot water storage tank 31. When the DC / AC inverter 21 is fixed to the common base plate 7, the vertical projection plane onto the common base plate 7 of the DC / AC inverter 21 is not overlapped with the tank vertical projection plane. It is arranged near the tank vertical projection plane.
[0013]
If comprised in this way, when the fuel cell main body 12 is fixed to the common base plate 7, it is not necessary to perform piping work between the hot water tank 31 and the fuel cell main body 12 at the factory, and at the installation site. On-site construction can be simplified, and the fuel cell main body 12 is arranged next to the hot water tank 31 and close to the hot water tank 31, so that the space around the side surface of the hot water tank 31 can be reduced. Can be reduced, the installation space can be reduced, and the cost can be reduced.
[0014]
In addition, when the DC / AC inverter 21 is fixed to the common base plate 7, it is not necessary to perform piping work between the hot water tank 31 and the DC / AC inverter 21 at the factory and at the installation site. The site construction can be made simpler, and the DC / AC inverter 21 is arranged next to the hot water tank 31 and close to the hot water tank 31, so that the space around the side surface of the hot water tank 31 can be reduced. It can be used effectively, and the installation space can be further reduced and the cost can be reduced.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the mutually same or equivalent member, and the overlapping description is abbreviate | omitted.
[0016]
FIG. 1 is a diagram showing a configuration of a fuel cell cogeneration system 1 according to a first embodiment of the present invention, in which FIG. 1 (A) is a front view, FIG. 1 (B) is a right side view, and FIG. (C) is a plan view. In FIG. 1A, the front wall, the right side wall in FIG. 1B, and the ceiling wall in FIG. 1C are omitted (the same applies to FIGS. 2 and 3 described later).
[0017]
As shown in the figure, a fuel cell cogeneration system 1 includes a fuel cell power generation unit 2 as a fuel cell power generation system, a DC / AC inverter unit 3 as a power conversion system, a hot water tank unit 4 as a hot water supply system, The control panel 5 having the control device 41, the above-described units 2, 3, 4 and the control panel 5 are collectively accommodated, a rectangular parallelepiped housing 6 formed by processing a steel plate, and the steel plate processing And a base 7 as a common base plate.
[0018]
The fuel cell power generation unit 2 includes a reformer 11, a fuel cell main body 12, a DC / DC converter 13, and an auxiliary device unit 14. The reformer 11, the fuel cell main body 12, the DC / DC converter 13, and the auxiliary device unit 14 are substantial main components of the fuel cell power generation unit 2. The DC / AC inverter unit 3 includes a DC / AC inverter 21. The DC / AC inverter 21 is a substantial main component device of the DC / AC inverter unit 3. The hot water tank unit 4 includes a hot water tank 31 and a cooking device 32. The hot water tank 31 and the additional cooking device 32 are substantial main components of the hot water tank unit 4. The control device 41 controls the fuel cell cogeneration system 1.
[0019]
The reformer 11 receives supply of raw material fuel (not shown), reformed additive water (not shown), and air (not shown), reforms the raw material fuel, selectively oxidizes it, and generates fuel gas. The fuel cell main body 12 receives supply of fuel gas and air (not shown) as an oxidant gas, and generates direct-current power by an electrochemical reaction between the fuel gas and oxygen in the air. The DC / DC converter 13 converts the voltage of the generated DC power.
[0020]
The auxiliary device unit 14 includes an exhaust heat recovery device (not shown) that recovers exhaust heat from at least one of the reformer 11, the fuel cell main body 12, and the DC / DC converter 13 by exhaust heat recovery water, and a fuel cell main body. 12, an air supply device (not shown) for supplying air to the reformer 11, a raw material supply device (not shown) for supplying raw material fuel to the reformer 11 and the additional cooking device 32, and the reformer 11 A reforming / addition water supply device (not shown) that supplies the reforming / addition water and a fuel cell cooling device (not shown) that cools the fuel cell body 12 with cooling water and adjusts the temperature of the fuel cell body 12 are provided. Each of the aforementioned devices included in the auxiliary device unit 14 is fixedly installed (fixed) with respect to the base 7.
[0021]
The DC / AC inverter 21 converts the DC power whose voltage has been converted by the DC / DC converter 13 into AC power.
The hot water storage tank 31 stores exhaust heat recovery water (not shown) obtained by recovering exhaust heat by an exhaust heat recovery device (not shown). The additional cooking device 32 has a faucet (not shown) for supplying hot water using the exhaust heat recovery water as hot water. When the temperature of the hot water in the hot water tank 31 is higher than a predetermined temperature (for example, 42 ° C.), the additional cooking device 32 mixes the hot water from the hot water tank 31 and city water (lower temperature than the hot water), and the hot water temperature is Adjust the temperature so that it reaches a predetermined temperature. If the temperature of the hot water in the hot water storage tank 31 is lower than the predetermined temperature, the additional cooking device 32 raises the hot water to the predetermined temperature and supplies hot water.
[0022]
The hot water tank 31 and the control panel 5 are fixedly installed on the base 7. The fuel cell body 12, the reformer 11, the DC / DC converter 13, the DC / AC inverter 21, and the cooking device 32 are fixedly installed with respect to the base 7.
[0023]
In FIG. 1A, a hot water tank 31 is disposed in the left half of the housing 6. The hot water storage tank 31 has a cylindrical shape, and the diameter of the circle which is the shape of the horizontal cross section of the hot water storage tank 31 is slightly smaller than the depth Dc1 inside the housing 6, and the height of the hot water storage tank 31 is the height of the housing 6. It is slightly shorter than the internal height Hc1. The width Wc <b> 1 inside the housing 6 is approximately twice the diameter of the horizontal cross-sectional circle of the hot water tank 31.
[0024]
In FIG. 1A, a fuel cell main body 12 is disposed on the upper right half of the housing 6. A reformer 11 is disposed below the fuel cell main body 12 and on the right side in FIG. 1A in the middle of the housing 6, and on the left side is a DC / DC converter 13 and a DC / AC inverter 21. Are arranged one above the other. The DC / AC inverter 21 is disposed below the DC / DC converter 13. A control panel 5 is disposed on the right side in FIG. 1A at the bottom of the housing 6, and an auxiliary device unit 14 is disposed on the left side.
[0025]
Therefore, the fuel cell main body 12, the reformer 11, the DC / DC converter 13, the DC / AC inverter 21, and the auxiliary device unit 14 include a cylindrical hot water storage tank 31 disposed inside the casing 6 having a rectangular parallelepiped shape. It is arranged in a gap space other than the occupied space. When a cylinder is arranged inside the rectangular parallelepiped, a gap is formed inside the rectangular parallelepiped. Therefore, devices other than the hot water tank 31 are arranged in the vicinity of the hot water tank 31 so as to fill the gap. All devices can be arranged in one housing 6, and conventionally, a housing for a fuel cell power generation unit, a housing for a power conversion system, a housing for a hot water tank unit, and three housings. Although a body is necessary, all the devices are accommodated in one housing 6 as described above. Further, since the exhaust heat recovery device (not shown) and the DC / AC inverter 21 are housed in one housing 6, the exhaust heat from the DC / AC inverter 21 can be easily recovered.
[0026]
In the present embodiment, the vertical projection surface on the base 7 of the fuel cell main body 12 is arranged so as not to overlap the vertical projection surface (tank vertical projection surface) on the base 7 of the hot water tank 31, and the hot water tank 31. Arranged in the vicinity of the vertical projection surface to the base 7, the vertical projection surface to the base 7 of the DC / AC inverter 21 is arranged so as not to overlap the vertical projection surface to the base 7 of the hot water tank 31, and the hot water storage tank 31 is arranged in the vicinity of the vertical projection plane onto the base 7.
[0027]
Furthermore, each vertical projection surface to the base 7 of the reformer 11, the DC / DC converter 13, the auxiliary device unit 14, the control panel 5, and the cooking device 32 overlaps with the vertical projection surface to the base 7 of the hot water tank 31. It arrange | positions so that it may not become, and is arrange | positioned in the vicinity of the vertical projection surface to the base 7 of the hot water storage tank 31. FIG.
[0028]
Further, the fuel cell main body 12, the reformer 11, the DC / DC converter 13, the DC / AC inverter 21, the auxiliary device unit 14, and the control panel 5 are arranged vertically (up and down in the present embodiment) in the vertical direction. Therefore, a space other than the space occupied by the hot water storage tank 31 in the housing 6 can be used effectively, and the capacity of the housing 6 can be reduced.
[0029]
Therefore, the volume of the housing 6, that is, the fuel cell cogeneration system 1 can be made compact, and the installation space can be reduced. Moreover, since the DC / AC inverter 21 and the auxiliary device unit 14 including the exhaust heat recovery device are accommodated in the same housing 6, the exhaust heat from the DC / AC inverter 21 can be easily recovered. is there.
[0030]
Since the entire fuel cell cogeneration system 1 is housed in a single housing 6 installed on a single base 7, the fuel cell unit 2 and the DC / AC inverter unit, which had been previously constructed locally 3, wiring (not shown) and piping (not shown) connecting between the fuel cell unit 2 and the hot water tank unit 4 can be manufactured in the factory before being transported to the installation site in advance. No local work on wiring and piping is required. Since the housing 6 that is installed on the base 7 and is unified is only required to be installed at the installation site, the field work is reduced.
[0031]
The exhaust heat recovery water is stored in the hot water storage tank 31, and the exhaust heat recovery water stored in the hot water storage tank 31 is at least one of the exhaust heat from the reformer 11 and the exhaust heat from the DC / DC converter 13. Heat recovery is performed by using an exhaust heat recovery device (not shown) so as to recover, and the circulating exhaust heat recovery water is subjected to heat exchange between the exhaust heat recovery water and the cooling water for cooling the fuel cell body 12. When configured to pass a vessel (not shown), the cooling water can be pure water and the exhaust heat recovery water can be city water.
[0032]
However, the exhaust heat recovery water is stored in the hot water storage tank 31, a heat exchange tube (not shown) is provided in the hot water storage tank 31, and the circulating water is supplied to at least the heat exchange tube, the reformer 11, and the DC / DC converter 13. If the fuel cell body 12 is circulated by any one of the fuel cell main bodies 12 and circulated by the exhaust heat recovery device (not shown), the exhaust heat recovery device also serves as the fuel cell cooling device, and the circulating water also serves as the cooling water for the fuel cell main body. Therefore, pure water is used as circulating water.
[0033]
In this case, by storing the fuel cell cogeneration system 1 in one housing 6 installed on one base 7, the above-mentioned circulating water connection between the fuel cell unit 2 and the hot water tank unit 4 is performed. This eliminates the need for on-site construction of pipes, and eliminates the need for on-site work on specially-designed pipes used for pure water. Therefore, the site construction at the installation site can be made simpler.
[0034]
FIG. 2 is a diagram illustrating a configuration of a fuel cell cogeneration system 101 according to the second embodiment of the present invention, in which FIG. 2 (A) is a front view, FIG. 2 (B) is a right side view, and FIG. (C) is a plan view. In the following, differences in configuration from the first embodiment will be mainly described. The points not described below are the same as the configuration of the fuel cell cogeneration system 1 (FIG. 1) according to the first embodiment. The code of each device corresponds to the code of the corresponding device of the first embodiment plus 100.
[0035]
Similar to the fuel cell cogeneration system 1 (FIG. 1), the fuel cell cogeneration system 101 includes a fuel cell power generation unit 102, a hot water tank unit 104, and a housing 106. The hot water tank unit 104 includes two hot water tanks 131 </ b> A and 131 </ b> B and a cooking device 132. The two hot water storage tanks 131 </ b> A and 131 </ b> B have the same shape and are disposed in the width direction of the housing 106.
[0036]
Like the fuel cell power generation unit 2 (FIG. 1), the fuel cell power generation unit 102 includes an auxiliary device unit 114, and the auxiliary device unit 114 includes an exhaust heat recovery device (not shown).
[0037]
The dimension of the depth Dc1 of the housing 6 of the fuel cell cogeneration system 1 (FIG. 1) is mainly limited by the diameter of the hot water storage tank 31 (FIG. 1), and cannot be made smaller than the diameter. When the fuel cell cogeneration system 101 according to the present embodiment is installed in a general home or apartment house, there is a limit to the allowable installation space, and in particular, the dimension of the depth Dc2 of the housing 106 is required to be small. In the present embodiment, in order to meet this requirement, the number of hot water storage tanks is set to a plurality instead of one, and a plurality of hot water storage tanks are arranged in the width direction of the housing 106 to satisfy the required hot water storage tank capacity. The dimension of the depth Dc2 of the body 106 can be reduced and optimized.
[0038]
FIG. 3 is a diagram showing a configuration of a fuel cell cogeneration system 201 according to the third embodiment of the present invention, in which FIG. 3 (A) is a front view, FIG. 3 (B) is a right side view, and FIG. (C) is a plan view. In the following, differences in configuration from the first embodiment will be mainly described. The points not described below are the same as the configuration of the fuel cell cogeneration system 1 (FIG. 1) according to the first embodiment. The code of each device corresponds to a code obtained by adding 200 to the code of the corresponding device in the first embodiment.
[0039]
Similar to the fuel cell cogeneration system 1 (FIG. 1), the fuel cell cogeneration system 201 includes a hot water tank unit 204, a housing 206, and a base 207. The hot water tank unit 204 is connected to the hot water tank 231. And a cooking device 232. The additional cooking device 232 is disposed above the hot water storage tank 231.
[0040]
The hot water tank 231 has a rectangular parallelepiped shape, and the shape of the horizontal section is a rectangle. By doing so, the dimension of the depth Ds3 of the hot water tank 231 can be freely set. This is because the width Ws3 or height Hs3 of the hot water storage tank 231 can be increased when the depth Ds3 of the hot water storage tank 231 is reduced, and the width Ws3 or height Hs3 can be reduced when the depth Ds3 is increased. Therefore, the depth Ds3 of the hot water storage tank 231 can be reduced and optimized by taking into account the dimension of the hot water storage tank 231 in the depth direction of other devices. In order to reduce the depth Dc3 of the housing 206, it is not necessary to use a plurality of cylindrical hot water storage tanks having a small diameter, and the cost can be reduced. In this respect, the present embodiment is different from the second embodiment (FIG. 2).
[0041]
As described above, in the fuel cell cogeneration system 201 of the present embodiment, the depth Dc3 of the housing 206 can be reduced and optimized, so that, for example, the depth is narrow as an installation place in a general home. It can be installed along the wall even at a place. Further, the fuel cell cogeneration system 201 is not arranged vertically as shown in the figure, but by placing the fuel cell cogeneration system 201 on the ground and placing it horizontally, for example, the dimension of the depth Dc3 of the casing 206 when arranged vertically is increased. For example, it can be installed in a low place such as under the floor of a general household.
[0042]
【The invention's effect】
As described above, according to the present invention, at least one of all or part of the fuel cell power generation system, all or part of the power conversion system, and the common hot water storage tank are fixed. Since there is no need to perform piping work between the hot water storage tank and the one fixed to the common base plate at the factory, it is possible to simplify the on-site construction at the installation site. The space around the hot water tank can be reduced, the installation space can be reduced, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a fuel cell cogeneration system according to a first embodiment of the present invention. FIG. 1 (A) is a front view, and FIG. 1 (B) is a right side view. FIG. 1C is a plan view.
FIG. 2 is a diagram showing a configuration of a fuel cell cogeneration system according to a second embodiment of the present invention, in which FIG. 2 (A) is a front view and FIG. 2 (B) is a right side view. FIG. 2C is a plan view.
FIG. 3 is a diagram showing a configuration of a fuel cell cogeneration system according to a third embodiment of the present invention, FIG. 3 (A) is a front view, and FIG. 3 (B) is a right side view. FIG. 3C is a plan view.
4 is a front view of a conventional fuel cell cogeneration system. FIG. 4 (A) is a hot water tank unit, FIG. 4 (B) is a fuel cell power generation unit, and FIG. 4 (C) is a DC / DC. AC inverter unit.
[Explanation of symbols]
1, 101, 201 Fuel cell cogeneration system 2 Fuel cell power generation unit (fuel cell power generation system)
3 DC / AC inverter unit (power conversion system)
4 Hot water storage unit (hot water supply system)
5 Control panel 6 Housing 7 Base (Common base plate)
DESCRIPTION OF SYMBOLS 11 Reformer 12 Fuel cell main body 13 DC / DC converter 14 Auxiliary device unit 21 DC / AC inverter 31 Hot water tank 32 Additional cooking device 41 Control device

Claims (3)

A fuel cell power generation system including a fuel cell main body that generates DC power by an electrochemical reaction between a fuel gas and an oxidant gas;
A power conversion system including a DC / AC inverter that converts the generated DC power into AC power;
A hot water supply system configured to include a hot water storage tank that stores exhaust heat recovered from at least one of the fuel cell power generation system and the power conversion system as hot water, and supplies hot water of the stored hot water;
A common base plate on which all or part of the fuel cell power generation system, all or part of the power conversion system, and the hot water storage tank are fixed;
Fuel cell cogeneration system. The common base plate includes substantially all the main components of the fuel cell power generation system, substantially all the main components of the power conversion system, and substantially all the main components of the hot water supply system. And are fixed;
The fuel cell cogeneration system according to claim 1. When the fuel cell main body is fixed to the common base plate, a vertical projection surface of the fuel cell main body on the common base plate does not overlap with a tank vertical projection surface of the hot water storage tank on the common base plate. Arranged in the vicinity of the tank vertical projection plane;
When the DC / AC inverter is fixed to the common base plate, the vertical projection plane of the tank so that the vertical projection plane of the DC / AC inverter on the common base plate does not overlap the vertical tank projection plane. Placed in the vicinity of
The fuel cell cogeneration system according to claim 1 or 2.

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