power plant

Abstract

To provide a power generating plant having more excellent space efficiency while securing a space for work.SOLUTION: A power generating plant comprises a plurality of power generating units having a plurality of fuel cell systems arranged in one row. A first power generating unit and a second power generating unit are arranged in parallel at predetermined intervals in a cross direction orthogonal to both of a longitudinal direction in which the fuel cell systems are arranged and a height direction of the power generating units. At least one or more power generating unit are movably arranged in the cross direction between the first power generating unit and the second power generating unit.SELECTED DRAWING: Figure 9A

Description

Technical Field

[0001] The present invention relates to a power generation plant.

Background Art

[0002] Patent Document 1 discloses a fuel cell module in which four fuel cell stacks are arranged in two rows and two columns in a front view, with each stack separated from the others within a single housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When constructing a power generation plant by using a plurality of the fuel cell modules described in the above document, the fuel cell modules will be arranged in the front-back, left-right directions as described in the above document. However, for the fuel cell module described in the above document, it is necessary to secure a working space for maintenance, inspection, etc. in the front-back direction. And when arranging a plurality of rows of the fuel cell modules described in the above document in the front-back direction, a working space must be secured between adjacent rows, so the area required for installing the fuel cell modules becomes large.

[0005] Therefore, an object of the present invention is to provide a power generation plant that is more space-efficient while securing a working space.

Means for Solving the Problems

[0006] According to one aspect of the present invention, a power plant is provided that comprises a plurality of power generation units, each having a plurality of fuel cell systems arranged in a row. In this plant, a first power generation unit and a second power generation unit are arranged parallel to each other with a predetermined distance between them in a direction perpendicular to both the left-right direction, which is the direction in which the fuel cell systems are lined up, and the height direction of the power generation units, and at least one power generation unit is arranged between the first power generation unit and the second power generation unit so as to be movable in the front-rear direction. [Effects of the Invention]

[0007] According to the above embodiment, it is possible to provide a power plant that is more space-efficient while securing working space. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view showing the schematic configuration of a stationary fuel cell system. [Figure 2] Figure 2 is a front view of a stationary fuel cell system. [Figure 3] Figure 3 is a rear view of a stationary fuel cell system. [Figure 4] Figure 4 is a left side view of a stationary fuel cell system. [Figure 5] Figure 5 shows an excerpt of the fuel system components of a stationary fuel cell system. [Figure 6] Figure 6 shows the pair of cross members and the power generation module as viewed from the rear before assembly. [Figure 7A] Figure 7A is a front view showing an example of a power generation unit utilizing the fuel cell system shown in Figure 1. [Figure 7B] Figure 7B is a front view showing another example of a power generation unit utilizing the fuel cell system shown in Figure 1. [Figure 8A] Figure 8A shows the piping route of the intake system. [Figure 8B] Figure 8B shows the piping route of the exhaust system. [Figure 8C] Figure 8C shows a power system circuit. [Figure 9A] FIG. 9A is a diagram showing an example of the arrangement of the power generation units. [Figure 9B] FIG. 9B is a diagram showing another example of the arrangement of the power generation units. [Figure 10] FIG. 10 is a diagram for explaining the effect of reducing the installation space of the power generation units. [Figure 11] FIG. 11 is a diagram for explaining the stopper mechanism of the power generation units. [Figure 12] FIG. 12 is a diagram showing the arrangement of the power generation units according to the configuration of the modified example. [Figure 13] FIG. 13 is a diagram for explaining the movable mechanism. [Figure 14] FIG. 14 is an enlarged view of the movable mechanism. [Figure 15] FIG. 15 is a diagram showing the exhaust connection pipe. [Figure 16] FIG. 16 is a diagram showing the intake connection pipe.

MODE FOR CARRYING OUT THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0010] The power generation plant according to the embodiment of the present invention includes a plurality of power generation units 60 in which a plurality of stationary fuel cell systems (hereinafter, also simply referred to as fuel cell systems) 1 are arranged in a row. In the following description, the fuel cell system 1, the power generation unit 60, and the power generation plant will be described in this order.

[0011] FIG. 1 is a perspective view showing a schematic configuration of a fuel cell system 1. FIG. 2 is a front view of the fuel cell system 1. FIG. 3 is a rear view of the fuel cell system 1. FIG. 4 is a left side view of the fuel cell system 1. FIG. 5 is a diagram excerpting fuel system components of the fuel cell system 1. In the present embodiment, the height direction of the fuel cell system 1 is the vertical direction, the flow path direction of intake pipes 8 and exhaust pipes 9 described later is the left - right direction, and the direction orthogonal to the vertical direction and the left - right direction is the front - rear direction. Also, regarding the front - rear direction, the side where the connection portions with respective pipes 13 and 14 of an auxiliary structure 7 described later are provided is defined as the front (front face). Regarding the left - right direction, it is based on the front view.

[0012] The fuel cell system 1 according to the present embodiment is used for stationary purposes. Further, the fuel cell used in the fuel cell system 1 is a solid oxide fuel cell.

[0013] The fuel cell system 1 includes two power generation modules 2, one piping module 3, a power recovery module 4 as one electrical equipment module, and a frame body 5 that supports these.

[0014] The power generation module 2 includes an auxiliary structure 7, a first fuel cell stack 6A disposed on one surface in the vertical direction of the auxiliary structure 7, and a second fuel cell stack 6B disposed on the other surface. The fuel cell stack 6 is formed by stacking a plurality of single cells in the vertical direction. The vertical dimension of the first fuel cell stack 6A is larger than the vertical dimension of the second fuel cell stack 6B. That is, the first fuel cell stack 6A has a larger number of stacked single cells than the second fuel cell stack 6B.

[0015] When there is no need to distinguish between the first fuel cell stack 6A and the second fuel cell stack 6B, it is referred to as the fuel cell stack 6. Also, in the present embodiment, a configuration in which the fuel cell stack 6 is disposed on both surfaces in the vertical direction of the auxiliary structure 7 will be described, but a configuration in which the fuel cell stack 6 is disposed on only one of the surfaces may also be acceptable.

[0016] The auxiliary equipment structure 7 is a housing that includes auxiliary equipment (such as a heat exchanger and a combustor) that exchanges gas with the fuel cell stack 6.

[0017] Furthermore, the power generation module 2 includes a fuel injection unit 24 that injects fuel to be supplied to the fuel cell stack 6 of the power generation module 2. The fuel injection unit 24 in this embodiment has two fuel injectors, but the number of fuel injectors is not limited to this.

[0018] The piping module 3 includes an intake pipe 8 through which air supplied to the power generation module 2 flows, an exhaust pipe 9 through which gas discharged from the power generation module 2 flows, a fuel pipe 11 through which fuel supplied to the power generation module 2 flows, and injection unit cooling water pipes 10 and 12 through which cooling water for cooling the fuel injection unit 24 flows. In the following description, the injection unit cooling water pipes 10 and 12 may simply be referred to as "cooling water pipes 10 and 12". Also, cooling water pipe 10 may be referred to as the inlet cooling water pipe 10, and cooling water pipe 12 as the outlet cooling water pipe 12.

[0019] The power recovery module 4 includes a power box 19 that houses equipment and wiring for recovering the power generated by the power generation module 2 and transmitting it to the power converter 43 (described later), as well as equipment and wiring for drawing power necessary for driving auxiliary equipment from external facilities. The power box 19 is made of an insulated metal component. Known methods of insulation can be used.

[0020] The frame 5 consists of multiple frame members, a cross member 20, and first and second stays 21 and 22, arranged to surround two power generation modules 2 and one piping module 3.

[0021] Inside the frame 5, two power generation modules 2 are arranged stacked vertically, with a piping module 3 positioned between them. Hereafter, when it is necessary to distinguish between the upper and lower power generation modules 2, the upper one will be referred to as the upper power generation module 2A, and the lower one as the lower power generation module 2B.

[0022] By stacking two power generation modules 2 vertically, the area required for installing the fuel cell system 1 can be reduced compared to a configuration where two power generation modules 2 are installed on the same plane (hereinafter also referred to as a flat layout). Furthermore, in the case of a flat layout, piping such as intake pipes 8 and exhaust pipes 9 are placed between adjacent power generation modules 2, and piping branching from there to each auxiliary equipment structure 7 is installed. In contrast, in the fuel cell system 1 of this embodiment, the piping module 3 is placed between the power generation modules 2 that are stacked vertically, so when viewed from above, the area occupied by piping is smaller compared to a flat layout. In other words, according to the fuel cell system 1 of this embodiment, it is possible to further reduce the area required for installing a fuel cell system 1 equipped with multiple power generation modules 2.

[0023] The frame 5 includes, for example, an upper portion surrounding the upper power generation module 2A, a lower portion surrounding the lower power generation module 2B, and an intermediate portion surrounding the piping module 3. The upper portion includes at least 12 frame members assembled in a box shape to surround the upper power generation module 2A, a cross member 20 arranged to cross the left and right sides defined by the frame members in the front-rear direction, and first stays 22 and second stays 21 arranged to cross the front and rear sides (i.e., the front and back) defined by the frame members in the left-right direction. The lower portion has the same configuration as the upper portion. The intermediate portion includes at least 4 frame members connecting the upper portion and the lower portion at predetermined intervals in the vertical direction.

[0024] The fuel cell system 1 is equipped with power lines to supply power necessary for the operation of the fuel injection unit 24, the auxiliary equipment included in the auxiliary equipment structure 7, the valve bodies and actuators that drive each valve body in the intake branch pipe 13 and exhaust branch pipe 14 (described later) (hereinafter collectively referred to as "auxiliary equipment") from an externally installed power source. The fuel cell system 1 is also equipped with signal lines to send the necessary control signals from an externally installed control device to the auxiliary equipment. Hereinafter, these will be collectively referred to as "power and signal lines". The power and signal lines are routed along the frame members of the frame 5 from the power recovery module 4 to the connected auxiliary equipment. The power and signal lines can be divided into main wiring connected to the externally installed power source and control device, and branch wiring that branches off from the main wiring and connects to the auxiliary equipment of each fuel cell system 1.

[0025] The upper power generation module 2A has the first fuel cell stack 6A positioned above the auxiliary structure 7 and the second fuel cell stack 6B positioned below it. This state will also be referred to as the upright state. On the other hand, the lower power generation module 2B has the same structure as the upper power generation module 2A, but the first fuel cell stack 6A is positioned below the auxiliary structure 7 and the second fuel cell stack 6B is positioned above it. In other words, it is the upper power generation module 2A inverted vertically around an axis extending in the front-to-back direction. This state will also be referred to as the inverted state. Similarly, the part of the frame 5 surrounding the upper power generation module 2A and the part of the frame 5 surrounding the lower power generation module 2B have the same structure but inverted vertically. In this way, by using two power generation modules 2 of the same structure, one in the upright state and the other in the inverted state, costs can be reduced compared to using multiple types of power generation modules 2. Furthermore, by adopting the same structure for both the upper and lower sections, the same shape and dimensions of piping and wiring can be used between the piping module 3 and the power generation module 2, which also reduces costs.

[0026] Furthermore, the two power generation modules 2 are positioned so that their front-to-back central axis Cm is offset to the rear side relative to the front-to-back central axis Cf of the frame 5 (see Figure 4). The power generation modules 2 are fixedly supported by a pair of cross members 20 provided on the right and left sides of the frame 5 and a first stay 22 provided on the rear of the frame 5. The cross members 20 connect a pair of vertically extending frame members that define the left and right sides of the frame. The first stay 22 connects a pair of frame members that define the rear of the frame 5. The method of fixing the power generation modules 2 to the frame 5 will be described later.

[0027] Each pipe in the piping module 3 is positioned so that the flow path is oriented in the left-right direction relative to the frame 5. The intake pipe 8 and exhaust pipe 9 are supported by the frame 5 via stays (not shown). The fuel pipe 11 and cooling water pipes 10 and 12 are supported by brackets 25 provided on the frame 5.

[0028] As described above, the piping module 3 is positioned between the upper power generation module 2A and the lower power generation module 2B. More specifically, the intake pipe 8 is positioned so as to overlap with the fuel cell stack 6 when viewed from above, while the exhaust pipe 9 is positioned so as not to overlap with the fuel cell stack 6 when viewed from above. By positioning the exhaust pipe 9, through which high-temperature exhaust gases flow, in this manner, the heat emitted from the exhaust pipe 9 can easily escape upwards, thereby suppressing the temperature rise of electrical components such as the fuel injection unit 24.

[0029] Flanges are provided at both ends of the intake pipe 8 and exhaust pipe 9 in the left-right direction. When multiple fuel cell systems 1 are connected in the left-right direction, as will be described later, pipes of the same diameter with flanges of the same shape at both ends are fastened to these flanges with bolts or the like. At the terminal points, covers of the same shape as the flanges are attached to seal the holes and prevent leakage of intake and exhaust gases.

[0030] The exhaust pipe 9 is a cylindrical single-pipe member except for the flanges at both ends. In contrast, the intake pipe 8 has a larger flow path cross-sectional area in the portion sandwiched between the flanges at both ends compared to the area of ​​the openings provided in the flanges. Furthermore, the flow path cross-sectional area in the portion sandwiched between the flanges at both ends of the intake pipe 8 is larger than the flow path cross-sectional area in the portion sandwiched between the flanges at both ends of the exhaust pipe 9. In other words, the intake pipe 8 has a larger flow path volume than the exhaust pipe 9. In this embodiment, the intake pipe 8 is a rectangular parallelepiped with circular openings on its left and right sides, but it is not limited to this, and any shape that satisfies the above-mentioned conditions is acceptable.

[0031] The fuel pipe 11 and the cooling water pipes 10 and 12 are fitted with ribs (not shown) at both ends. When multiple fuel cell systems 1 are connected in the left-right direction, the fuel pipes 11 and cooling water pipes 10 and 12 of adjacent fuel cell systems 1 are connected to each other via rubber pipes or the like (not shown).

[0032] The intake pipe 8 and the power generation module 2 are connected via an intake branch pipe 13. More specifically, the intake branch pipe 13, which branches off from the intake pipe 8, is connected to an intake port 7A provided in the auxiliary equipment structure 7.

[0033] The exhaust pipe 9 and the power generation module 2 are connected via an exhaust branch pipe 14. More specifically, the exhaust branch pipe 14, which branches off from the exhaust pipe 9, is connected to an exhaust port 7B provided on the auxiliary equipment structure 7. The exhaust gas discharged from the power generation module 2 becomes hot, and the connection point between the auxiliary equipment structure 7 and the exhaust branch pipe 14 also becomes hot, so the exhaust branch pipe is made of metal. In addition, the temperature of the air flowing inside the intake branch pipe 13 and the temperature of the connection point between the auxiliary equipment structure 7 and the intake branch pipe 13 are lower than those of the exhaust branch pipe 14, so rubber piping can be used in parts where heat is not easily transferred from the high-temperature power generation module 2, exhaust branch pipe 14, and exhaust pipe 9.

[0034] As described above, the upper power generation module 2A is in an upright position, and the lower power generation module 2B is in an inverted position, with the piping module 3 positioned between the two power generation modules 2. As a result, in both power generation modules 2, the second fuel cell stack 6B, which has a shorter vertical dimension than the first fuel cell stack 6A, is positioned closer to the piping module 3. In other words, the distance from the piping module 3 to each auxiliary equipment structure 7 is shorter compared to the case where the upper power generation module 2A is in an inverted position and the lower power generation module 2B is in an upright position.

[0035] The intake port 7A and exhaust port 7B are located on the front side of the auxiliary structure 7 when viewed from above. Also, as described above, the power generation module 2 is positioned offset to the rear side relative to the frame 5. Therefore, a distance is secured between the intake port 7A and exhaust port 7B and the frame 5, providing ample space for routing the intake branch pipe 13 and exhaust branch pipe 14. In this embodiment, the exhaust branch pipe 14 is provided on the underside of the portion of the auxiliary structure 7 that protrudes to the front side relative to the fuel cell stack 6, and is connected from below; this is also included in "located on the front side of the auxiliary structure 7 when viewed from above." Alternatively, the exhaust port 7B may open in the forward direction, similar to the intake port 7A, and the exhaust branch pipe 14 may be connected from the front.

[0036] Furthermore, if either the air intake port 7A or the exhaust port 7B is located on the rear side of the auxiliary equipment structure 7 when viewed from above, the amount by which the power generation module 2 can be offset to the rear side is limited due to the presence of piping connected to it. As a result, dead space is created on both the front and rear sides. On the other hand, in the fuel cell system 1 of this embodiment, the air intake port 7A and the exhaust port 7B are concentrated on the front side, so the rear side of the power generation module 2 can be brought closer to the rear side of the frame 5. In other words, according to this embodiment, the dead space (IS in Figure 4) that occurs between the rear side of the frame 5 and the rear side of the power generation module 2 can be made smaller.

[0037] Furthermore, in the upper power generation module 2A, the intake port 7A is located on the left side and the exhaust port 7B is located on the right side when viewed from the front. On the other hand, in the lower power generation module 2B, the intake port 7A is located on the right side and the exhaust port 7B is located on the left side when viewed from the front. In other words, the arrangement of the intake port 7A and exhaust port 7B is reversed between the upper power generation module 2A and the lower power generation module 2B. This allows the positions of the connection point of the intake pipe 8 to the intake branch pipe 13 for the upper power generation module 2A and the connection point of the intake branch pipe 13 for the lower power generation module 2B to be shifted in the left-right direction. The intake branch pipe 13 has ancillary equipment such as a valve body and an actuator that drives the valve body (neither of which are shown), but by shifting the positions of the two connection points in the left-right direction in this way, the positions of the ancillary equipment can be distributed, and there is more flexibility in the routing of the two intake branch pipes 13. Furthermore, if the two connection points are located close together, problems may arise such as difficulty in air flowing to one of the intake branch pipes 13. However, as described above, this problem can be resolved by shifting the positions of the two connection points to the left and right. The same applies to the connection points of the exhaust pipe 9 to the two exhaust branch pipes 14.

[0038] In this embodiment, since the same power generation module 2 is used in both an upright and inverted state, it is natural that the arrangement of the intake port 7A and exhaust port 7B is reversed as described above. However, even if two power generation modules 2 with different structures are used, the arrangement of the intake port 7A and exhaust port 7B is reversed between the upper power generation module 2A and the lower power generation module 2B in order to resolve the above-mentioned problem.

[0039] Incidentally, when using the fuel cell system 1 in a power plant or the like, maintenance and inspection work is required, such as checking for leaks from each pipe and replacing consumables or faulty parts. In this embodiment of the fuel cell system 1, the power generation module 2 is positioned offset to the rear side relative to the frame 5, and the air intake ports 7A and exhaust ports 7B of the upper and lower power generation modules 2 are all located on the front side. Therefore, ancillary equipment such as shut-off valves, which will be described later, included in the piping module 3 can also be concentrated on the front side. As a result, with this embodiment of the fuel cell system 1, the amount of movement required by workers during maintenance and inspection work is reduced, and work efficiency can be improved.

[0040] Furthermore, during maintenance and inspection work, if the work area is low, workers will have to bend down or, in some cases, lie down. Conversely, if the work area is high, workers will have to stretch or stand on a step stool. In either case, these factors worsen work efficiency. However, in the fuel cell system 1 of this embodiment, the upper power generation module 2A is in an upright position, and the lower power generation module 2B is in an inverted position, with the piping module 3 positioned between the two power generation modules 2. As a result, the positions of the auxiliary equipment structures 7 of the upper and lower power generation modules 2 are centered in the vertical direction of the fuel cell system 1, thus suppressing deterioration of work efficiency.

[0041] Furthermore, the inventors' investigation revealed that if the height of the work area from the installation surface is within the range of approximately 400mm-1500mm, the deterioration of workability can be suppressed. Therefore, although the dimensions of the power generation module 2 and the frame 5 can be set arbitrarily, from the viewpoint of the above-mentioned workability, the dimensions of the power generation module 2 and the frame 5 are set so that the height of the intake port 7A and exhaust port 7B of the upper and lower power generation modules 2 from the installation surface is within the range of 400mm-1500mm. It is also desirable that the connection between the fuel supply pipe 26 and the auxiliary equipment structure 7, which will be described later, be within this range.

[0042] The fuel injection unit 24 is fixedly supported by a second stay 21 located on the front of the frame 5. Fuel is supplied from the fuel piping 11 to the fuel injection unit 24 via a fuel branch pipe 15, from the fuel injection unit 24 to the auxiliary equipment structure 7 via a fuel supply pipe 26, and from there to the power generation module 2. The connection between the fuel supply pipe 26 and the auxiliary equipment structure 7 is located on the front side of the auxiliary equipment structure 7 when viewed from above, similar to the intake port 7A and the exhaust port 7B. The fuel injection unit 24 also includes a coolant gallery 27 surrounding the injection part of the fuel injector. The coolant gallery 27 and the inlet coolant piping 10 are connected by a first coolant branch pipe 17, and the coolant gallery 27 and the outlet coolant piping 12 are connected by a second coolant branch pipe 16. In other words, the coolant is supplied from the inlet coolant pipe 10 to the coolant gallery 27 via the first coolant branch pipe 17, where it cools the fuel injection valve, and then flows into the outlet coolant pipe 12 via the second coolant branch pipe 16.

[0043] The inlet coolant pipe 10 is located on the non-insertion side relative to the fuel pipe 11, while the outlet coolant pipe 12 is located on the insertion side relative to the fuel pipe 11. In other words, the inlet coolant pipe 10 is located at the position furthest from the exhaust pipe 9, the outlet coolant pipe 12 is located at the position closest to the exhaust pipe 9, and the fuel pipe 11 is located between the inlet coolant pipe 10 and the outlet coolant pipe 12. The reason for this arrangement is as follows.

[0044] As mentioned above, the coolant flowing through the coolant pipes 10 and 12 is for cooling the fuel injection unit 24. Therefore, it is desirable that the inlet coolant pipe 10, through which the coolant flows before being used to cool the fuel injection unit 24, receive less heat from the exhaust pipe 9 through which the high-temperature exhaust gas flows. On the other hand, the coolant used to cool the fuel injection unit 24 is then cooled by a radiator (not shown), so the outlet coolant pipe 12 has a larger tolerance for heat transfer from the exhaust pipe 9 compared to the inlet coolant pipe 10. Also, from the viewpoint of reactivity in the fuel cell stack 6, it is desirable for the fuel to evaporate easily (i.e., at a higher temperature), but it is undesirable for the fuel to become so hot that bubbles are generated in the fuel pipe 11. Therefore, the inlet coolant pipe 10, through which we want to suppress heat transfer from the exhaust pipe 9, is positioned furthest from the exhaust pipe 9, the outlet coolant pipe 12, through which the heat from the exhaust pipe 9 has less negative impact, is positioned closest to the exhaust pipe 9, and the fuel pipe 11, through which it is desirable for the temperature to rise to a temperature at which the fuel evaporates easily after injection, is positioned between these two.

[0045] The power box 19 is located on the back of the frame 5, between the upper and lower power generation modules 2. The power generation modules 2 and the power box 19 are electrically connected via a busbar 18, which serves as a branch power line. The busbar 18 is taken out from the surface opposite to the surface in contact with the auxiliary structure 7 of the fuel cell stack 6 (i.e., the top and bottom surfaces), extends in a direction different from the direction of the exhaust pipe 9, and connects to the power box 19 through a wiring passage 23 provided along the frame member of the frame 5. Here, "extending in a direction different from the direction of the exhaust pipe 9" means not approaching the exhaust pipe 9. The power box 19 houses the main power line 53, which is connected to the externally installed power converter 43, and the busbar 18 is connected to this main power line 53. The wiring passage 23 is also made of insulated metal material, similar to the power box 19. This reduces the frequency with which live parts such as the busbar 18 and electrical wires come into contact with the frame member when the unit is disassembled for maintenance and inspection work.

[0046] When two power generation modules 2 are laid flat, it is necessary to provide a separate space for the power box 19 from the installation space for the power generation modules 2. However, with the configuration of this embodiment, this is no longer necessary. In other words, the area required for the installation of the fuel cell system 1 can be reduced.

[0047] Next, with reference to Figure 6, the method for attaching the power generation module 2 to the frame 5 will be explained.

[0048] Figure 6 shows the pair of cross members 20 and the power generation module 2 as seen from the rear before assembly. Note that at this stage, the first stay 22 is not attached to the frame 5.

[0049] On the opposing surfaces of the pair of cross members 20, guide grooves 33 are provided that extend in the front-rear direction (horizontal direction), with at least the rear end being an open end. The auxiliary structure 7 of the power generation module 2 is provided with a first slide portion 31 and a second slide portion 32, which have shapes corresponding to the guide grooves 33. In Figure 6, the slide member 30, which includes the second slide portion 32, is manufactured separately from the auxiliary structure 7 and attached to the auxiliary structure 7, but the second slide portion 32 may also be formed integrally with the housing of the auxiliary structure 7.

[0050] Then, with the back of the frame 5 as the insertion surface and the front as the non-insertion surface, the power generation module 2 is moved from the insertion surface along the guide groove 33 by aligning the first slide portion 31 and the second slide portion 32 with the guide groove 33, thereby inserting the power generation module 2 into the inside of the frame 5. After insertion, the power generation module 2 and the frame 5 are rigidly connected using the first stay 22. This fixes the power generation module 2 to the frame 5. At this time, if the guide groove 33 is provided from one end to the other of the cross member 20, it would be necessary to insert the power generation module 2 into the frame 5 while checking its position to position the power generation module 2. However, in this embodiment, the position of the front end of the guide groove 33 is aligned with the position of the first slide portion 31 when the power generation module 2 is properly positioned. In other words, the positioning of the power generation module 2 is completed when the first slide portion 31 is inserted until it contacts the front end of the guide groove 33. This makes positioning easier. Furthermore, the insertion surface is on the rear side, the connection points between the auxiliary structure 7 and each pipe are on the front side of the auxiliary structure 7, and each pipe is routed to avoid interference with the trajectory when the auxiliary structure 7 slides. Therefore, the power generation module 2 can be removed from the frame 5 by disconnecting the connections to each pipe. In other words, there is no need to remove each pipe from the frame 5 when replacing the power generation module 2, etc.

[0051] Furthermore, when the power generation module 2 is fixed to the frame 5 as described above, the auxiliary structure 7 of the power generation module 2 also functions as a structural member connecting the pair of cross members 20 provided on the left and right sides of the frame 5. The upper part of the frame 5 has its surface rigidity strengthened by the pair of cross members 20 on each of the left and right sides, by the second stay 21 on the front, and by the second stay 21 on the back. However, the auxiliary structure 7 functions as a structural member that crosses each of the left and right sides, thereby improving the rigidity of the entire upper part. The same applies to the lower part. This helps to suppress deformation and collapse due to external forces such as earthquakes.

[0052] Next, a power generation unit 60 equipped with multiple fuel cell systems 1 will be described with reference to Figures 7A and 7B.

[0053] Figure 7A is a front view showing power generation unit 60A as an example of power generation unit 60. Figure 7B is a front view showing power generation unit 60B as another example of power generation unit 60. Note that power generation unit 60 is a general term for a unit that includes power generation unit 60A, power generation unit 60B, and other components. First, let's explain the power generation unit 60A shown in Figure 7A.

[0054] As shown in Figure 7A, multiple fuel cell systems 1 are arranged adjacent to each other in the left-right direction, and their respective frames 5 are rigidly connected to each other by bolts or the like. As a result, the pair of rigidly connected frame members function as reinforcing members for each other, suppressing deformation of the frame 5. The intake pipes 8, exhaust pipes 9, fuel piping 11, and cooling water piping 10 and 12 of each fuel cell system 1 are also connected. The intake pipes 8 of adjacent fuel cell systems 1 are connected via connecting pipes. The same applies to the exhaust pipes 9. The connecting pipes have flanges at both ends and are formed from cylindrical pipe members whose flow path cross-section is the same shape as the openings provided in the flanges of the intake pipes 8 and exhaust pipes 9. The fuel piping 11 and cooling water piping 10 and 12 of adjacent fuel cell systems 1 are connected via connecting pipes (e.g., rubber piping). As a result, the connected linear intake pipe (main intake piping) 8, exhaust pipe (main exhaust piping) 9, fuel piping (main fuel piping) 11, and cooling water piping 10 and 12 are positioned between the row of upper power generation modules 2A and the row of lower power generation modules 2B. In addition, the wiring contained within the power boxes 19 of adjacent fuel cell systems 1 are electrically connected.

[0055] As described above, the intake pipe 8, exhaust pipe 9, fuel pipe 11, and cooling water pipes 10 and 12 are connected in a straight line, which suppresses pressure loss compared to cases where there are bends. In addition, all of these pipes are accessible from the front, resulting in excellent workability.

[0056] Furthermore, as described above, in each fuel cell system 1, the intake pipe 8 has a flow path cross-sectional area in the portion sandwiched between flanges on the left and right sides (hereinafter also referred to as the "flow path portion") which is larger than the area of ​​the opening provided in the flange, and the volume of the flow path portion is larger than that of the exhaust pipe 9. For this reason, the air supplied to the intake pipe 8 via the aforementioned joint is stored in the flow path portion before flowing into the intake branch pipe 13 connected to the upper power generation module 2A and the intake branch pipe 13 connected to the lower power generation module 2B. In other words, the flow path portion functions similarly to a surge tank in the intake system of an internal combustion engine, and effects such as equalization of the air supplied to the two upper and lower power generation modules 2 can be obtained.

[0057] A second frame 40 is connected to one end (the right end in Figure 7A) in the left-right direction of a row of multiple fuel cell systems 1 connected together (hereinafter also referred to as the fuel cell row). The second frame 40 is fixedly supported by an air inlet pipe 41, one end of which is connected to an intake pipe 8; an exhaust outlet pipe 42, one end of which is connected to an exhaust pipe 9; a power converter 43; a fuel inlet pipe 45, one end of which is connected to a fuel pipe 11; a cooling water inlet pipe 44, one end of which is connected to a cooling water pipe 10; and a cooling water outlet pipe 46, one end of which is connected to a cooling water pipe 12. Hereinafter, the second frame 40, air inlet pipe 41, exhaust outlet pipe 42, power converter 43, fuel inlet pipe 45, cooling water inlet pipe 44, and cooling water outlet pipe 46 are collectively referred to as the external connection module 47. The fuel cell row and the external connection module 47 together are referred to as the power generation unit 60A.

[0058] At the other end of the fuel cell array in the left-right direction, the openings of the intake pipe 8, exhaust pipe 9, and fuel pipe 11 are closed with lids or plugs. Also, the end of the cooling water pipe 10 and the end of the cooling water pipe 12 are connected.

[0059] The other end of the air intake pipe 41 is connected to an intake system 57, such as a blower 57, located outside the power generation unit 60A. The other end of the exhaust outlet pipe 42 is connected to an exhaust system 58, such as an exhaust treatment device, located outside the power generation unit 60A.

[0060] The other end of the fuel inlet pipe 45 is connected to a fuel system (not shown) that includes a fuel tank, a pressure regulating valve, etc. The other ends of the cooling water inlet pipe 44 and the cooling water outlet pipe 46 are connected to a cooling system (not shown) that includes a cooling water tank, a circulation pump, a radiator, etc.

[0061] The power converter 43 is electrically connected to each power box 19 of the fuel cell row via power wiring. In other words, the power generated by each power generation module 2 of the fuel cell row is output through a single power converter 43. By consolidating the power converter 43 into one in this way, the following effects can be obtained. First, the installation area of ​​the power generation unit can be reduced compared to a configuration in which a power converter 43 is placed in each individual fuel cell system 1. Also, when a cooling mechanism is provided for the power converter 43, the cooling mechanism configuration is simplified because there is only one place to cool, and costs can be reduced. Furthermore, when connecting even more fuel cell systems 1, a fuel cell row may be formed to the right of the external connection module 47 in Figure 7A, similar to the left side. In this case, the air inlet pipe 41, exhaust outlet pipe 42, fuel inlet pipe 45, cooling water inlet pipe 44, and cooling water outlet pipe 46 are each branched and connected to the fuel cell row connected to the right side. The power wiring is similar, and the fuel cell row on the right side is also electrically connected to the power converter 43.

[0062] Next, the power generation unit 60B shown in Figure 7B will be described. The power generation unit 60B in Figure 7B consists of six fuel cell systems 1 and one external connection module 47.

[0063] As shown in Figure 7B, the power generation unit 60B has an equal number of fuel cell systems 1 (three on each side in this embodiment) arranged on both the left and right sides of the external connection module 47.

[0064] The intake pipe 41 and the exhaust pipe 42 each branch into two, connecting to the fuel cell row on the left and the battery row on the right.

[0065] With the above configuration, the distance from the external connection module 47 to the fuel cell system 1 at the opposite end of the fuel cell array, which consists of six fuel cell systems 1 arranged in series, is shorter compared to a configuration where the external connection module 47 is placed at one end of the fuel cell array. Furthermore, the configuration is symmetrical. This makes it possible to suppress variations in intake volume and power loss that occur depending on the distance from the external connection module 47.

[0066] Incidentally, the power generation module 2 of each fuel cell system 1 can be removed from the insertion side by disconnecting the connections between the pipes 13, 14, and 26 and the auxiliary structure 7 from the non-insertion side, disconnecting the main power line and branch power line on the insertion side, and disconnecting the main power / signal line and branch wiring. However, in a power generation unit consisting of multiple fuel cell systems 1, since the intake pipes 8 and exhaust pipes 9 of each fuel cell system 1 are connected in series, simply disconnecting the connections between the auxiliary structure 7 and the intake branch pipe 13 and exhaust branch pipe 14 will leave the intake port 7A and exhaust port 7B open to the atmosphere. In this case, the operation of the power generation unit must be stopped in order to replace one power generation module 2.

[0067] Furthermore, when the fuel cell system 1 is shut down for inspection or other purposes, it is necessary to stop the supply of air and fuel gas. However, in order to inspect only a specific power generation module 2 while the power generation unit is running, a mechanism is needed to stop the supply only to the power generation module 2 being inspected. The same applies to the power transmission path, including the busbar 18, and the power and signal lines.

[0068] Therefore, the fuel cell system 1 of this embodiment has a mechanism described below that makes it possible to stop only the specific power generation module 2 mentioned above.

[0069] Figure 8A shows the piping route of the intake system, Figure 8B shows the piping route of the exhaust system, and Figure 8C shows the circuit of the power system that transmits the electricity generated by the power generation module 2.

[0070] As shown in Figure 8A, the intake system comprises an intake main piping consisting of intake pipes 8 of each fuel cell system 1 and fittings 54 connecting them, an air introduction pipe 41 connected to the intake main piping, an intake connection pipe 73 (described later), an intake equipment 57, and intake branch pipes 13 of each fuel cell system 1. The intake equipment 57 is a blower 57 that supplies air to the intake main piping. Each intake branch pipe 13 is provided with a shut-off valve 50 that can open and close the flow path. Note that the shut-off valves 50 are omitted in Figures 1 to 7B.

[0071] As shown in Figure 8B, the exhaust system comprises an exhaust main piping consisting of exhaust pipes 9 for each fuel cell system 1 and fittings 55 connecting them, an exhaust outlet pipe 42 connected to the exhaust main piping, exhaust branch pipes 14 for each fuel cell system 1, an exhaust connecting pipe 70 (described later), and exhaust equipment 58. Each exhaust branch pipe 14 is provided with a shut-off valve 51 that can open and close the flow path. Note that the shut-off valves 51 are omitted in Figures 1 to 7.

[0072] As shown in Figure 8C, the power system comprises the main power lines 53 of each fuel cell system 1, the power lines 56 connecting them, the power converter 43, and the busbars 18 of each fuel cell system 1. Each busbar 18 is equipped with a circuit breaker 52. Note that the circuit breakers 52 are omitted in Figures 1 to 7.

[0073] Although not shown in the diagram, a shut-off valve is also provided between the fuel pipe 11 and the fuel injection unit 24.

[0074] Next, we will explain how to configure a power plant using the power generation unit 60 described above, referring to Figures 9A to 16. Here, we will explain the case where three power generation units 60 (60B) shown in Figure 7B are used.

[0075] Figures 9A and 9B show the area of ​​the power plant where the power generation units 60 are located, viewed from the left. Here, the power generation unit 60 on the rear side is referred to as the first power generation unit 60-1, the power generation unit 60 on the front side is referred to as the second power generation unit 60-2, and the power generation unit 60 sandwiched between them is referred to as the intermediate power generation unit 60-3.

[0076] The first power generation unit 60-1 and the second power generation unit 60-2 are fixedly arranged parallel to each other with a predetermined distance between them. The predetermined distance is, for example, twice the front-to-back dimension of the power generation unit 60. The intermediate power generation unit 60-3 is positioned between the first power generation unit 60-1 and the second power generation unit 60-2, and is movable parallel to the first power generation unit 60-1 and the second power generation unit 60-2 in the front-to-back direction. The mechanism that enables movement will be described later. Figure 9A shows the case where the intermediate power generation unit 60-3 is on the side of the first power generation unit 60-1, and Figure 9B shows the case where the intermediate power generation unit 60-3 is on the side of the second power generation unit 60-2.

[0077] The effects of the intermediate power generation unit 60-3 being movable as described above will be explained with reference to Figure 10.

[0078] The lower part of Figure 10 shows the configuration of this embodiment (the state shown in Figure 9B), while the upper part of Figure 10 shows a configuration in which three power generation units 60 are fixedly arranged in three rows while ensuring workspace (hereinafter also referred to as the comparative example). Note that the configuration of the comparative example is not included in the scope of the present invention.

[0079] As mentioned above, maintenance and inspection of the power generation unit 60 requires disconnecting and reconnecting the pipes 13, 14, and 26 from the auxiliary equipment structure 7, as well as disconnecting and reconnecting the main power line from the branch power line. For this purpose, workspace is required on both the front and rear sides of the power generation unit 60.

[0080] Therefore, in the comparative example configuration where the three power generation units 60 are fixed in place, work spaces must be provided in front of and behind each power generation unit 60. As a result, four work spaces are required: behind the first power generation unit 60-1 (S1), between the first power generation unit 60-1 and the intermediate power generation unit 60-3 (S3), between the intermediate power generation unit 60-3 and the second power generation unit 60-2 (S5), and in front of the second power generation unit 60-2 (S7). If the front-to-back dimensions of each work space are made the same as the front-to-back dimensions of the power generation unit 60, then the four work spaces (S1, S3, S5, S7) and the installation spaces for the three power generation units 60 (S2, S4, S6) combined will require space equivalent to seven rows of power generation units 60.

[0081] In contrast, in the configuration of this embodiment, the three work spaces—the rear (S1) and front (S3) of the first power generation unit 60-1, and the front (S6) of the second power generation unit 60-2—combined with the installation spaces for the three power generation units 60 (S2, S4, S5), amount to only six rows of power generation units 60. This is because when working on the front of the intermediate power generation unit 60-3, the intermediate power generation unit 60-3 can be moved to space S3. Furthermore, this movement also allows for work on the rear of the second power generation unit 60-2.

[0082] As described above, the configuration of this embodiment makes it possible to reduce the space required for installing the power generation unit 60. In the above description, the predetermined distance between the first power generation unit 60-1 and the second power generation unit 60-2 was described as twice the length of the front-to-back dimension of the power generation unit 60, but it is not limited to this. Any distance that allows for a working space to be secured between the first power generation unit 60-1 and the intermediate power generation unit 60-3, or between the second power generation unit 60-2 and the intermediate power generation unit 60-3, by moving the intermediate power generation unit 60-3 is acceptable.

[0083] Incidentally, the movable intermediate power generation unit 60-3 may be provided with a stopper mechanism 61 that restricts movement in the states shown in Figures 9A and 9B. The stopper mechanism 61 consists of, for example, a vertically movable guide pin 62 attached to the frame member of the frame 5 as shown in Figure 11, and a hole (not shown) located on the installation surface. When moving the intermediate power generation unit 60-3, the guide pin 62 is raised, and when the state shown in Figure 9A or Figure 9B is reached, the guide pin 62 is lowered and inserted into the hole.

[0084] Here, a modified example of this embodiment will be described with reference to Figure 12. This modified example also falls within the scope of the present invention. Figures 12(A) to (D) show the movement of the power generation unit 60 according to the modified example.

[0085] This modified example is similar to the above embodiment in that the intermediate power generation unit 60-3 is movable in the front-rear direction, but differs in that the first power generation unit 60-1 and the second power generation unit 60-2 are also movable in the front-rear direction.

[0086] In state (A) of Figure 12, work can be performed on the front side of the second power generation unit 60-2. Then, by moving the second power generation unit 60-2 to the front, state (B) can be achieved, allowing work to be performed on the rear side of the second power generation unit 60-2. In this state, work can also be performed on the front side of the intermediate power generation unit 60-3.

[0087] Furthermore, by moving the intermediate power generation unit 60-3 to the front, as in (C), it becomes possible to perform work on the rear side of the intermediate power generation unit 60-3 and work on the front side of the first power generation unit 60-1. Then, by moving the first power generation unit 60-1 to the front, as in (D), it becomes possible to perform work on the rear side of the first power generation unit 60-1.

[0088] In this modified configuration, the installation space required for the three power generation units 60 in the power plant is only the space equivalent to four rows of power generation units 60 (S1-S4), which is even less space than in the above embodiment.

[0089] Next, the movable mechanism 64 for moving the intermediate power generation unit 60-3 will be described with reference to Figures 13 to 16.

[0090] Figure 13 is a front view of the intermediate power generation unit 60-3. Figure 14 is an enlarged view of the movable mechanism 64.

[0091] As shown in Figure 13, each fuel cell system 1 of the intermediate power generation unit 60-3 is provided with a movable mechanism 64 at its lower part. Note that there only need to be at least two movable mechanisms 64 positioned to maintain the intermediate power generation unit 60-3 in a nearly horizontal position.

[0092] As shown in Figure 14, the movable mechanism 64 comprises a rail 67 with a C-shaped cross-section extending in the front-rear direction and a wheel module 68. In Figure 14, because it is a front view, it appears that one wheel module 68 is provided for each fuel cell system 1, but in reality, one is provided for the front frame member and one for the rear frame member of the frame 5 of each fuel cell system 1.

[0093] Rail 67 is laid on the mounting surface of the intermediate power generation unit 60-3 with the opening side of its C-shaped cross-section facing upwards.

[0094] The wheel module 68 includes an inner wheel 66 that can roll along the inside of the rail 67 in the longitudinal direction of the rail 67, an outer wheel 65 that can roll along the upper surface of the rail 67 in the longitudinal direction of the rail 67, and a stay 69 that is attached to the frame member of the frame 5 and supports the inner wheel 66 and the outer wheel 65. In Figure 13, there are two outer wheels 65 and two inner wheels 66, but this is not the only option; at least one inner wheel 66 and one outer wheel 65 are required.

[0095] According to the movable mechanism 64 described above, the intermediate power generation unit 60-3 can basically move in the front-rear direction by the outer wheels 65 rolling along the outside of the upper surface of the rail 67. On the other hand, if the intermediate power generation unit 60-3 is tilted in the front-rear direction, for example, if it is tilted from the front to the back of the page in Figure 13, the wheel module 68 will lift up, the inner wheels 66 will come into contact with the inner upper surface of the rail 67, and the inner wheels 66 will roll. This prevents the intermediate power generation unit 60-3 from tipping over and also allows it to move even when tilted.

[0096] Next, the configurations for making the power generation unit 60 movable, other than the movable mechanism 64, will be described with reference to Figures 15 and 16. Figure 15 is a view from diagonally above of the power generation unit 60 arranged in three rows in the modified configuration described above, and Figure 16 is a view of the same power generation unit 60 from diagonally below. Note that each power generation unit 60 has been simplified.

[0097] The power generation unit 60 is connected to an exhaust system (not shown) outside the power generation unit 60 via an exhaust connection pipe 70. One end of the exhaust connection pipe 70 is connected to the upper end of the exhaust outlet pipe 42, and the other end is connected to the exhaust system. The exhaust connection pipe 70 is made of a metal member and includes a spherical joint 71 and an expansion joint 72. The expandable range of the expansion joint 72 includes at least the distance from the maximum to the minimum distance between the power generation unit 60 and the exhaust system.

[0098] When the power generation unit 60 moves in the front-to-back direction, the positional relationship between the exhaust connection pipe 70 and the power generation unit 60 changes when viewed from above. However, the exhaust connection pipe 70 can accommodate changes in angle using the spherical joint 71 and changes in distance using the expansion joint 72. The reason why the exhaust connection pipe 70, including the spherical joint 71 and the expansion joint 72, is made of metal is because the exhaust flowing through it is at a high temperature and it is necessary to ensure heat resistance.

[0099] Furthermore, the power generation unit 60 is connected to an external intake system (not shown) via an intake connection pipe 73. One end of the intake connection pipe 73 is connected to the lower end of the intake introduction pipe 41, and the other end is connected to the intake system 57. The intake connection pipe 73 includes a flexible member 74 in at least a portion of it. For example, a rubber tube is used as the flexible member 74. The portion other than the flexible member 74 is made of a metal member. The intake connection pipe 73 is housed in a piping storage space (not shown) provided below the rail 67 on the installation surface, and a predetermined range from one end is bent and extends upward. The flexible member 74 has a length such that even when the distance between the power generation unit 60 and the intake system 57 is at its maximum, it is less than or equal to its free length.

[0100] When the power generation unit 60 moves in the front-to-back direction, the positional relationship between the intake connection pipe 73 and the power generation unit 60 changes when viewed from above. However, the intake connection pipe 73 can accommodate this change by the bending deformation of the flexible member 74. A rubber tube can be used as the flexible member 74 because the intake air does not become as hot as the exhaust air, and there are no problems with the heat resistance of materials such as rubber.

[0101] In the above embodiment and modified example, there was one intermediate power generation unit 60-3, but a configuration with multiple intermediate power generation units 60-3 as described above is also possible. Next, I will explain the effects that can be obtained from the power plant described above.

[0102] According to this embodiment, in a power plant equipped with multiple power generation units 60 in which multiple fuel cell systems 1 are arranged in a row, the first power generation unit 60-1 and the second power generation unit 60-2 are arranged parallel to each other with a predetermined distance between them in the front-to-back direction, which is perpendicular to both the left-to-right direction in which the fuel cell systems 1 are lined up and the height direction of the power generation units 60, and at least one intermediate power generation unit 60-3 is arranged between the first power generation unit 60-1 and the second power generation unit 60-2 so as to be movable in the front-to-back direction. This makes it possible to reduce the installation area of ​​the power generation units 60 while securing workspace.

[0103] Furthermore, as shown in the modified example, the first power generation unit 60-1 and the second power generation unit 60-2 may also be movable in the front-to-back direction. This further reduces the installation area of ​​the power generation unit 60.

[0104] In this embodiment, a stopper mechanism 61 is provided to restrict the movement of each power generation unit 60. This prevents damage to the power generation units 60 due to unexpected movement of the power generation units 60 during operation or work of the power plant, and ensures safety.

[0105] In this embodiment, the fuel cell system 1 comprises two power generation modules 2, each including an auxiliary equipment structure 7 that exchanges gas with the fuel cell stack 6, and a fuel cell stack 6 connected to at least one of the vertical surfaces of the auxiliary equipment structure 7; and a piping module 3 that includes piping through which the gas exchanged between the power generation modules 2 and the auxiliary equipment structure 7 flows. The two power generation modules 2 are stacked vertically, and the piping module 3 is placed between the two stacked power generation modules 2. The piping modules 3 of adjacent fuel cell systems 1 are connected in series to form the intake main piping 8 and the exhaust main piping 9. By stacking the two power generation modules 2 vertically and placing the piping module 3 between them in this way, the installation area can be reduced to less than half compared to when the two power generation modules are placed on the same surface. In addition, the operating efficiency is improved because the upper layer is heated by the heat from the lower layer.

[0106] In this embodiment, the power generation unit 60 further includes an external connection module 47 which comprises an air inlet pipe 41 with one end connected to the main intake pipe 8 to introduce air from an intake facility 57 outside the power generation unit 60, an exhaust outlet pipe 42 with one end connected to the main exhaust pipe 9 to discharge air to an exhaust facility outside the power generation unit 60, and a power converter 43 that aggregates and outputs the electricity generated by the fuel cell system 1. As a result, the power extraction and the inlets and outlets of each gas are consolidated in one place, which reduces the installation area required for piping and wiring.

[0107] In this embodiment, the external connection module 47 is located at either the left or right end of the power generation unit 60. This concentrates the connections between the power generation module 2, the piping module 3, etc., and the external connection module 47 into one location, improving the efficiency of connection and disconnection operations.

[0108] In this embodiment, the same number of fuel cell systems 1 may be arranged on both the left and right sides of the external connection module 47. This helps to suppress variations in intake volume and power loss.

[0109] In this embodiment, the movable mechanism 64 further comprises a wheel module 68 having at least two rails 67 that extend in the left-right direction and have a C-shaped cross-section, laid on the installation surface where the power generation unit 60 is installed with the opening side of the C-shaped cross-section facing upwards, and an inner wheel 66 provided at the bottom of the power generation unit 60 and capable of rolling inside the rails 67, and an outer wheel 65 capable of rolling on the upper surface of the rails 67. As a result, the outer wheel 65 basically supports the weight of the power generation unit 60, and when a force in the direction of tipping is applied, the inner wheel 66 contacts the rails 67 to support the power generation unit 60, thereby reducing resistance when the power generation unit 60 moves and preventing it from tipping over.

[0110] In this embodiment, the other end of the exhaust outlet pipe 42 extends above the external connection module 47, and the exhaust outlet pipe 42 and the exhaust equipment outside the power generation unit 60 are connected via an exhaust connection pipe 70 equipped with a spherical joint 71 and an expansion joint 72. This allows for changes in the positional relationship between the power generation unit 60 and the exhaust equipment as the power generation unit 60 moves.

[0111] In this embodiment, the other end of the intake pipe 41 extends below the external connection module 47, and the intake pipe 41 and the intake equipment 57 outside the power generation unit 60 are connected via an intake connection pipe 73 which includes at least a flexible member 74 and is housed in a piping housing space located below the rail 67. This allows for changes in the positional relationship between the power generation unit 60 and the intake equipment 57 as the power generation unit 60 moves.

[0112] Furthermore, by positioning only the exhaust connection pipe 70 above the power generation unit 60, heat damage to the power generation unit 60 itself and other piping can be suppressed.

[0113] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments. [Explanation of symbols]

[0114] 1 Fuel cell system, 2 Power generation module, 3 Piping module, 4 Power recovery module, 5 Frame, 6 Fuel cell stack, 7 Auxiliary structure, 8 Intake pipe (main intake piping), 9 Exhaust pipe (main exhaust piping), 41 Intake connection pipe, 42 Exhaust connection pipe, 43 Power converter, 47 External connection module, 60 Power generation unit, 64 Movable mechanism

Claims

1. In a power plant equipped with multiple power generation units, each consisting of multiple fuel cell systems arranged in a row, The first power generation unit and the second power generation unit are arranged parallel to each other with a predetermined distance between them in the left-right direction, which is the direction in which the fuel cell systems are aligned, and in the front-rear direction, which is perpendicular to both the left-right direction and the height direction of the power generation units. A power plant characterized in that at least one of the power generation units is arranged between the first power generation unit and the second power generation unit so as to be movable in the front-rear direction.

2. In the power plant described in claim 1, A power plant in which the first power generation unit and the second power generation unit are also movable in the front-to-back direction.

3. In the power plant according to claim 2, A power plant equipped with a stopper mechanism to restrict the movement of each power generation unit.

4. In the power plant described in claim 1, The aforementioned fuel cell system Two power generation modules comprising: an auxiliary equipment structure including an auxiliary device for exchanging gas with a fuel cell stack; and the fuel cell stack connected to at least one of the vertical surfaces of the auxiliary equipment structure; A piping module comprising piping through which gas is exchanged between the power generation module and the auxiliary equipment structure, Equipped with, The two aforementioned power generation modules are arranged stacked vertically, The piping module is positioned between two of the power generation modules that are stacked on top of each other. A power plant in which the piping modules of adjacent fuel cell systems are connected in series to form a main intake pipe and a main exhaust pipe.

5. In the power plant according to claim 4, The aforementioned power generation unit is A power plant further comprising an external connection module having an air inlet pipe, one end of which is connected to the main intake pipe for introducing air from an intake facility outside the power generation unit; an exhaust outlet pipe, one end of which is connected to the main exhaust pipe for discharging air to an exhaust facility outside the power generation unit; and a power converter for aggregating and outputting the electricity generated by the fuel cell system.

6. In the power plant described in claim 5, The external connection module is located at either the left or right end of the power generation unit in the power generation plant.

7. In the power plant described in claim 5, A power plant in which the same number of fuel cell systems are arranged on both sides of the external connection module in the left-right direction.

8. In the power plant described in claim 5, At least two rails extending in the left-right direction and having a C-shaped cross-section, laid on the installation surface where the power generation unit is installed with the opening side of the C-shaped cross-section facing upwards, A wheel module provided at the bottom of the power generation unit, having an inner wheel capable of rolling along the inside of the rail and an outer wheel capable of rolling along the upper surface of the rail, A power plant further equipped with a movable mechanism.

9. In the power plant described in claim 5, The other end of the exhaust outlet pipe extends above the external connection module. A power plant in which the exhaust outlet pipe and the exhaust equipment outside the power generation unit are connected via an exhaust connecting pipe equipped with a spherical joint and an expansion joint.

10. In the power plant described in claim 5, The other end of the air intake pipe extends below the external connection module. A power plant in which the air intake pipe and the intake equipment outside the power generation unit are connected via an intake connection pipe that includes at least a flexible member in part and is housed in a piping housing space provided below the rail.

Images