JP4464594B2 - Fuel cell power generation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel cell power generation system.
[0002]
[Prior art]
In recent years, a power generation system incorporating a fuel cell has been proposed as a cogeneration system in consideration of environmental problems. As this fuel cell, a cell constructed by stacking a plurality of single cells is known. As a single cell, an electrolyte membrane, an anode and a cathode sandwiching the electrolyte membrane, and fuel gas are supplied to the anode. In addition, a device is known that includes an oxidant gas supplied to the cathode and a separator that forms a partition wall between adjacent single cells. As a fuel gas, a fuel gas that uses a hydrogen-rich gas obtained by a reaction between a hydrocarbon fuel and water in a fuel gas generator heated by a burner or the like is known.
[0003]
By the way, in a fuel cell power generation system, one in which components such as a fuel cell and a fuel gas generator are housed in one package is known. For example, in Japanese Patent Laid-Open No. 9-199152, a single package is divided into a fuel chamber, a motor chamber, and a power supply chamber, and a hydrogen generator, a fuel cell, and a heat exchanger that generate hydrogen as fuel gas in the fuel chamber. Each component is accommodated.
[0004]
[Problems to be solved by the invention]
However, the above-mentioned publication does not consider the layout in which the respective components such as the hydrogen generator, fuel cell, and heat exchanger are arranged. It was difficult to make the element work functionally.
[0005]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a fuel cell power generation system capable of operating system components functionally. Another object of the present invention is to provide a fuel cell power generation system suitable for adopting a compact package.
[0006]
[Means for solving the problems and their functions and effects]
In order to achieve at least one of the above-described objects, the present invention adopts the following configuration.
[0007]
  According to a first aspect of the present invention, a fuel cell that generates power by an electrochemical reaction between a fuel gas and an oxidizing gas, a control unit that controls the amount of power generated by the fuel cell, and a high-temperature unit that has a high temperature during system operation are provided. A fuel cell power generation system comprising:
  The control unit and the high temperature unit;Is the sameIn the same packageAwayArranged,
  The control unit is a surface on the opposite side of the high temperature part arrangement surface on which the high temperature part is arranged in the package.ArrangedPlaced,
The high temperature part includes a fuel gas generation part that supplies a hydrogen rich gas obtained by a reaction between a hydrocarbon fuel and water as a fuel gas to the fuel cell,
  Between the control unit and the fuel gas generation unit, a water tank that stores water for reaction in the fuel gas generation unit is adjacent to the control unit as a low temperature unit in which the temperature during system operation is low. TheIt is what is arranged.
[0008]
  In this fuel cell power generation system, the control unit, which is one of the components of the system, is arranged away from the high-temperature unit, and therefore is not easily affected by the high-temperature unit during system operation and is not easily heated. Therefore, according to this fuel cell power generation system, the control unit can operate satisfactorily in function.Moreover, since the control part is arrange | positioned on the surface on the opposite side to the high temperature part arrangement | positioning surface where the high temperature part was arrange | positioned among packages, a control part and a high temperature part can be arrange | positioned comparatively largely. For this reason, it is difficult to increase the temperature of the controller. In addition, the fuel gas generation unit becomes high temperature during system operation, but the control unit is disposed away from the fuel gas generation unit, so that it is prevented from being heated by the fuel gas generation unit. Moreover, since the water tank is arrange | positioned as the said low-temperature part in the vicinity of the said control part, a control part is shielded effectively by a water tank.
[0010]
In the first fuel cell power generation system of the present invention, the fuel cell, the control unit, and the high temperature unit may be housed in the same package, and the fuel cell may be disposed above the high temperature unit. By doing so, air warmed in the high temperature part at the time of system startup or the like is likely to gather around the fuel cell, so that warm-up performance is improved. In this system configuration, the fuel cell may be disposed above the high-temperature unit and the control unit, and the fuel cell may be provided with a pipe connection unit for gas and cooling water at one end and a power extraction unit at the other end. Good. This makes it possible to connect pipes and take out electric power in a relatively small space, and is suitable for adopting a compact package.
[0012]
In the first fuel cell power generation system of the present invention, the high temperature portion is consumed by the fuel cell when the fuel cell is not passed through the system when the system is started or when the system is operating (that is, when the fuel cell is generating power). An off-gas combustion unit for burning the fuel gas that has not been present may be included. By so doing, the control unit is disposed away from the off-gas combustion unit that becomes hot due to the combustion of the fuel gas, so that the control unit is prevented from being heated up by the off-gas combustion unit.
[0014]
In the first fuel cell power generation system of the present invention, the low temperature portion includes an anode offgas heat exchanger that takes heat of the anode offgas discharged from the anode of the fuel cell, and a cathode offgas discharged from the cathode of the fuel cell. It may include at least one of a cathode off-gas heat exchanger that takes heat away and a cooling water heat exchanger that takes heat away from cooling water that cools the fuel cell. Each of the heat exchangers shown here is useful for shielding the control unit because the temperature during system operation is low. Here, the “anode offgas heat exchanger” also includes a condenser that condenses the moisture contained in the anode offgas, and the “cathode offgas heat exchanger” means a condensation that condenses the moisture contained in the cathode offgas. Including the vessel.
[0016]
A second aspect of the present invention is a fuel cell that generates power by an electrochemical reaction between a fuel gas and an oxidizing gas, a control unit that controls the amount of power generated by the fuel cell, and a gas discharge unit that discharges exhaust gas generated during system operation. The control unit and the gas discharge unit are housed in the same package, and the control unit has a gas discharge unit arrangement surface on which the gas discharge unit is arranged in the package. Is arranged on a different surface.
[0017]
In this fuel cell power generation system, the control unit, which is one of the components of the system, is arranged on a surface of the package that is different from the surface of the gas discharge unit. Can work.
[0018]
In the second fuel cell power generation system of the present invention, the control unit may be arranged on a surface opposite to the gas discharge unit arrangement surface. In this way, the control unit is less susceptible to exhaust gas. Here, the gas discharge unit may discharge off-gas discharged from the anode or cathode of the fuel cell (may be gas after being subjected to some processing after being discharged from the fuel cell). And exhausting the combustion exhaust gas from the combustion part for supplying the heat necessary for the reaction out of the fuel gas generation part for supplying the fuel cell with hydrogen-rich gas obtained by the reaction between the hydrocarbon fuel and water. May be.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an outline of the configuration of the fuel cell power generation system 10, and FIG. 2 is a block diagram showing signal input / output of the electronic control unit 60 of the fuel cell power generation system 10.
[0020]
As shown in FIG. 1, this fuel cell power generation system 10 mainly includes a reformer 30 for reforming city gas into hydrogen-rich reformed gas, and a fuel gas by reducing carbon monoxide in the reformed gas. A CO selective oxidation unit 34, a mixer 28 that supplies a mixture of city gas and steam in an appropriate ratio to the reformer 30, and a water tank 26 that serves as a supply source of steam supplied to the mixer 28. And a fuel cell 40 that generates electric power by an electrochemical reaction between the fuel gas and the oxidizing gas, and a heat exchange medium circulation path 50 that circulates water or hot water as the heat exchange medium 54 stored in the hot water tank 52. The heat exchangers 42, 44, 45, 46 are provided. 1 indicate the flow of the heat exchange medium 54 flowing through the circulation path 50, and (1) and (1), (2) and (2), and (3) and (3) are connected to each other. It shall be. Further, as shown in FIG. 2, the fuel cell power generation system 10 includes a DC / DC converter 5 that adjusts the voltage and current of the direct current power from the fuel cell 40 to convert it into desired direct current power, and the converted direct current power. Is converted to AC power having the same phase as that of the commercial power source 2 and supplied to the power line 12 for supplying power from the commercial power source 2 to the load 16 via the circuit breaker 7, and DC power with adjusted voltage or current A DC / DC converter 8 that functions as an auxiliary power source by stepping down a part of the power, a load wattmeter 4 that detects load power consumed by the load 16, and an electronic control unit 60 that serves as a control unit for controlling the entire system. It has.
[0021]
The reformer 30 supplies the mixture of the city gas and steam introduced from the mixer 28 to the steam reforming reaction and shift reaction of the following equations (1) and (2), thereby improving the hydrogen-rich reforming. Generates quality gas. The reformer 30 is provided with a combustion unit 32 that supplies heat necessary for such a reaction, and city gas is supplied to the combustion unit 32 from the gas pipe 22 via the valve 221 and the booster pump 223. At the same time, air necessary for combustion is supplied, and further, the anode off gas after passing through the anode off gas heat exchanger 42 is supplied. That is, in order to effectively use the anode off gas, unreacted hydrogen in the anode off gas can be used as the fuel of the combustion unit 32. In the present embodiment, a burner is employed as the combustion unit 32. The internal temperature of the reformer 30 including the combustion unit 32 during system operation reaches several hundred degrees Celsius (about 600 to 700 degrees Celsius).
[0022]
[Expression 1]
CH_Four+ H₂O → CO + 3H₂    (1)
CO + H₂O → CO₂+ H₂      (2)
[0023]
The CO selective oxidation unit 34 is modified by a carbon monoxide selective oxidation catalyst (for example, a catalyst made of an alloy of platinum and ruthenium) that receives supply of air from a pipe (not shown) and selects and oxidizes carbon monoxide in the presence of hydrogen. Carbon monoxide in the gas is selectively oxidized to obtain a hydrogen-rich fuel gas having a very low carbon monoxide concentration (about several ppm in this embodiment). The internal temperature of the CO selective oxidation unit 34 during system operation reaches several hundred degrees Celsius. The reformer 30 and the CO selective oxidation unit 34 correspond to the fuel gas generation unit of the present invention.
[0024]
The mixer 28 passes through the gas pipe 22 through the valve 221 and the booster pump 222 and then the city gas from which the sulfur content has been removed by the desulfurizer 24, and the steam from which water from the water tank 26 has been evaporated by the evaporator 27. They are mixed at an appropriate ratio and supplied to the reformer 30.
[0025]
The water tank 26 is connected to the evaporator 27 through a metering pump 261 and a valve 262. The water stored in the water tank 26 is supplied to the evaporator 27 by driving the metering pump 261. The water tank 26 is supplied with purified water from a water purifier 25 that purifies and purifies tap water, and is also connected to condensed water from an anode offgas heat exchanger 42 and a cathode offgas heat exchanger 44. Has been. The internal temperature of the water tank 26 during system operation is several tens of degrees Celsius (approximately 50 degrees C or less).
[0026]
The fuel cell 40 is configured as a solid polymer fuel cell in which a plurality of unit cells 410 (see FIG. 3) are stacked. The unit cell 410 includes an electrolyte membrane 412 and the electrolyte membrane 412 as shown in FIG. A separator having an anode 414 and a cathode 416 sandwiching the electrolyte membrane 412, a separator 418 having a fuel gas supply path 415 for supplying fuel gas to the anode 414, and an oxidizing gas supply path 417 for supplying oxidizing gas to the cathode 416 is provided. The separators 418 and 420 form a partition wall with the adjacent single cell 410. The anode 414 includes a catalyst electrode 414a and a gas diffusion electrode 414b, and the cathode 416 includes a catalyst electrode 416a and a gas diffusion electrode 416b. The fuel gas is supplied from the CO selective oxidation unit 34 to the anode 414 of each unit cell 410, and the air as the oxidation gas is supplied from the blower 41 through the humidifier 411 to the cathode 416 of each unit cell 410. Thus, power is generated by an electrochemical reaction between hydrogen in the fuel gas and oxygen in the oxidizing gas.
[0027]
In the heat exchange medium circulation path 50, the heat exchange medium 54 stored in the hot water storage tank 52 is transferred from the hot water storage tank 52 to the anode offgas heat exchanger 42, the cathode offgas heat exchanger 44, the combustion exhaust gas heat exchanger 45, and the cooling water heat exchange. The circulation path is such that after passing through the vessel 46 in this order, it returns to the hot water tank 52 again. The circulation pump 51 is provided in the middle of the heat exchange medium circulation path 50 and circulates the heat exchange medium 54 from the hot water storage tank 52 to the heat exchange medium circulation path 50. Hot water as the heat exchange medium 54 stored in the hot water storage tank 52 is supplied to a predetermined location through a hot water supply path (not shown), and hot water is supplied to the hot water storage tank 52 so that the hot water storage tank 52 is filled with water. The
[0028]
The anode off-gas heat exchanger 42 is fed from the CO selective oxidation unit 34 because the valve 61 and the valve 63 are opened and the valve 62 and the valve 64 are closed by the electronic control unit 60 when the system is started (immediately after the start of operation). Heat exchange is performed between the initial fuel gas and the heat exchange medium 54 passing through the heat exchange medium circulation path 50. In this anode off-gas heat exchanger 42, the heat exchange medium 54 recovers heat by depriving the initial latent heat of condensation of the fuel gas, and the fuel gas condenses moisture by depriving the latent heat of condensation and lowers the humidity. The anode offgas heat exchanger 42 supplies the fuel gas after the heat exchange to the initial offgas combustor 57. The fuel gas sent to the initial off-gas combustor 57 is catalytically combusted in the initial off-gas combustor 57 and then discharged to the outside through the initial off-gas heat exchanger 58 and the first gas discharge port 49 (see FIG. 4). . The initial offgas heat exchanger 58 and the initial offgas combustor 57 are incorporated in the cooling water circulation path 43, and the cooling water after passing through the fuel cell 40 causes the initial offgas heat exchanger 58 and the initial offgas combustor 57 to pass through this. Pass in order and cool.
[0029]
On the other hand, in the anode off gas heat exchanger 42, the valve 61 and the valve 63 are closed by the electronic control unit 60 and the valve 62 and the valve 64 are opened by the electronic control unit 60. Therefore, the anode 414 of the fuel cell 40 from the CO selective oxidation unit 34. Heat exchange is performed between the anode off-gas discharged via the heat exchange medium 54 and the heat exchange medium 54 passing through the heat exchange medium circulation path 50. In the anode off-gas heat exchanger 42, the heat exchange medium 54 recovers heat by depriving the condensation latent heat of the anode off-gas, and the anode off-gas condenses moisture and dehumidifies by depriving the condensation latent heat. The anode offgas heat exchanger 42 supplies the anode offgas after heat exchange to the combustion unit 32 and supplies condensed water obtained by condensing moisture in the anode offgas to the water tank 26. The internal temperature of the anode off-gas heat exchanger 42 during system operation is several tens of degrees Celsius (about 50 to 80 degrees Celsius).
[0030]
The cathode offgas heat exchanger 44 exchanges heat between the cathode offgas discharged from the cathode 416 of the fuel cell 40 and the heat exchange medium 54 that passes through the heat exchange medium circulation path 50. In the cathode offgas heat exchanger 44, the heat exchange medium 54 recovers heat by depriving the latent heat of condensation of the cathode offgas, and the cathode offgas condenses moisture by depriving the latent heat of condensation. Further, the cathode offgas heat exchanger 44 releases the cathode offgas after heat exchange from the first gas outlet 49 (see FIG. 4) to the atmosphere, and condensate water obtained by condensing moisture in the cathode offgas. Is supplied to the water tank 26. The internal temperature of the cathode offgas heat exchanger 44 during system operation is several tens of degrees Celsius (about 50 to 80 degrees Celsius).
[0031]
The combustion exhaust gas heat exchanger 45 performs heat exchange between the combustion exhaust gas generated in the combustion unit 32 and the heat exchange medium 54 that passes through the heat exchange medium circulation path 50. In the combustion exhaust gas heat exchanger 45, the heat exchange medium 54 takes heat from the combustion exhaust gas and recovers it. The combustion exhaust gas means that the anode off gas after passing through the city gas or the anode off gas heat exchanger 42 and oxygen in the air burn and pass through a jacket (not shown) provided so as to surround the reformer 30. The gas discharged from the second gas discharge port 59 (see FIG. 4).
[0032]
The cooling water heat exchanger 46 is provided in the middle of the cooling water circulation path 43. Here, the cooling water circulation path 43 is configured so that the cooling water stored in the reservoir tank 47 by the circulation pump 48 passes through the cooling water passage (not shown) of the fuel cell 40 from the reservoir tank 47 and then the initial off-gas heat exchanger 58 and the initial off-gas combustion. This is a circulation path that passes through a cooling water passage (not shown) of the vessel 57 and the cooling water heat exchanger 46 in this order and returns to the reservoir tank 47 again. However, a bypass path provided with a cooler 55 that performs forced cooling by a fan is provided between the coolant heat exchanger 46 and the reservoir tank 47 in the coolant circulation path 43, and the coolant is set in advance. When the temperature does not exceed, the thermostat 56 provided at the branch point of the bypass path does not operate, and the cooling water is immediately led from the cooling water heat exchanger 46 to the reservoir tank 47, whereas when the cooling water exceeds the predetermined temperature, the thermostat 56 is operated, and the cooling water is led to the bypass path and forcedly cooled by the cooler 55 and then led to the reservoir tank 47. The cooling water heat exchanger 46 is a cooling water after passing through the fuel cell 40, the initial off-gas heat exchanger 58 and the initial off-gas combustor 57 (which is heated by cooling each part) and a heat exchange medium circulation path. Heat exchange is performed with the heat exchange medium 54 passing through 50. Although the electrochemical reaction in the fuel cell 40 is an exothermic reaction, the fuel cell 40 is maintained at an appropriate temperature (80 to 90 ° C. in this embodiment) by circulating the cooling water in this way. The internal temperature of the cooling water heat exchanger 46 during system operation is several tens of degrees Celsius (about 50 to 80 degrees Celsius).
[0033]
As shown in FIG. 2, the output terminal of the fuel cell 40 is connected to the power line 12 from the commercial power supply 2 to the load 16 via the DC / DC converter 5, the inverter 6, and the circuit breaker 7. Is converted into AC power having the same phase as that of the commercial power source 2, added to the AC power from the commercial power source 2, and supplied to the load 16. Since the DC / DC converter 5 and the inverter 6 are configured as a general DC / DC converter circuit and an inverter circuit, detailed description thereof is omitted. The power line branched from the output side of the DC / DC converter 5 includes solenoids of various valves 29, 61 to 64, 221, 262, various pumps 48, 51, 222, 223, 261, a blower 41, and the like. A DC / DC converter 8 that functions as a DC power source for supplying DC power to the auxiliary machine is connected. The load 16 is connected to the power line 12 via the circuit breaker 18.
[0034]
The electronic control unit 60 is configured as a microprocessor including a well-known CPU, ROM, RAM, and the like. The electronic control unit 60 includes an output current and voltage from a current sensor and voltage sensor (not shown) in the inverter 6, load power from the load wattmeter 4, reformer 30, CO selective oxidation unit 34, and fuel cell 40. Each temperature from the attached temperature sensor (not shown) is input. Further, from the electronic control unit 60, drive signals to the solenoids of the various valves 29, 61 to 64, 221, 262, drive signals to the various pumps 48, 51, 222, 223, 261, and drive to the blower 41. In addition to the signal and the ignition signal to the combustion unit 32, a control signal to the DC / DC converter 5 and the DC / DC converter 8, a switching control signal to the inverter 6, a drive signal to the circuit breaker 7, and the like are output.
[0035]
When one of the high, middle, and low operation modes is determined according to the load power detected by the load wattmeter 4, the electronic control unit 60 uses the power determined according to the operation mode as the target output power. The power generation amount of the fuel cell 40 is controlled such that the DC power from the fuel cell 40 is converted by the inverter 6 and the AC power supplied to the power line 12 becomes the target output power, or the DC / DC converter 5 Control the inverter 6. Here, the control of the power generation amount of the fuel cell 40 is, for example, the supply amount of the fuel gas to the fuel cell 40 by controlling the city gas valve 221 and boost pump 222 or the metering pump 261 and valve 262 of the water tank 26. Or the supply amount of the oxidizing gas is controlled by controlling the blower 41.
[0036]
Next, the package configuration of the fuel cell power generation system 10 thus configured will be described. As shown in FIGS. 1 and 2, the fuel cell power generation system 10 includes a main body package 10a, a hot water storage package 10b, and a system linkage package 10c, and each of the packages 10a, 10b, and 10c has a single casing. Various system components are housed inside. That is, main body package 10a mainly includes reformer 30, CO selective oxidation unit 34, water tank 26, fuel cell 40, blower 41, anode offgas heat exchanger 42, cathode offgas heat exchanger 44, and combustion exhaust gas heat exchange. The container 45, the cooling water heat exchanger 46, the reservoir tank 47, the electronic control unit 60, and the like are housed. The hot water storage package 10b mainly contains a water purifier 25, a hot water tank 52, and the like. Furthermore, the system linkage package 10c mainly contains DC / DC converters 5 and 8, an inverter 6, and the like.
[0037]
The main body package 10a will be described in more detail with reference to FIG. FIG. 4 is an explanatory view showing the layout of the main components housed in the main body package 10a, and is a front view when a front door (not shown) that can be opened and closed or detached is opened in the main body package 10a, the left and right sides are widths, The top and bottom represent the height, and the front and back (perpendicular to the page) represent the depth. The main body package 10a of the present embodiment is a rectangular parallelepiped housing having a width of 700 mm, a depth of 360 mm, and a height of 900 mm, and has a compact size compared to the conventional case.
[0038]
A fuel cell 40, a reservoir tank 47, and a humidifier 411 are disposed at the uppermost stage of the main body package 10 a, and the reservoir tank 47 is disposed in front of the fuel cell 40. The fuel cell 40 includes a fuel gas, oxidant gas, and cooling water pipe connecting portion 40a on the left end wall, and a power extraction portion 40b that outputs power to the system linkage package 10c on the right end wall. Also, in the space below the fuel cell 40 in the main body package 10a, the reformer 30 and the CO selective oxidation unit 34 as the fuel gas generation unit and the electronic control unit 60 as the control unit are not adjacent but separated. Are arranged. Specifically, the reformer 30 and the CO selective oxidation unit 34, which are at a high temperature during system operation, are arranged so as to be substantially in contact with the left side surface of the main body package 10a, and the electronic control unit 60 is disposed on the right side surface of the main body package 10a. It is arrange | positioned so that it may touch substantially. Further, an off-gas combustor 57 having a high temperature at the time of starting the system is disposed in the vicinity of the reformer 30, and the electronic control unit 60 is disposed not adjacent to the off-gas combustor 57 but apart from it. Hereinafter, the CO selective oxidation unit 34, the reformer 30, and the off-gas combustor 57 are referred to as a high temperature unit.
[0039]
Between the high temperature section and the electronic control unit 60, an anode offgas heat exchanger 42, a cathode offgas heat exchanger 44, a cooling water heat exchanger 46, and a water tank 26, which are at a low temperature during system operation, are disposed. In particular, these are arranged in the vicinity of the electronic control unit 60. Further, the various pumps 48, 51, 222, 223, and 261 are disposed substantially at the center of the bottom surface of the main body package 10a, the blower 41 is disposed above the city gas, and city gas is introduced from the gas pipe 22 (see FIG. 1). A purified water inlet 25a for introducing purified water from the inlet 22a and the water purifier 25 of the hot water storage package 10b is provided on the right side surface of the main body package 10a.
[0040]
Further, the first gas exhaust port 49 and the second gas exhaust port 59 for exhausting exhaust gas generated during system operation are arranged on the left side surface opposite to the right side surface on which the electronic control unit 60 is arranged. . In the present embodiment, the exhaust gas after passing through the cathode offgas heat exchanger 44 during system operation is discharged to the outside from the first gas discharge port 49. Further, exhaust gas generated when the catalyst is combusted in the initial off-gas combustor 57 after passing through the anode off-gas heat exchanger 42 at the time of system startup also passes through the initial off-gas heat exchanger 58 to the outside from the first gas exhaust port 49. Discharged. On the other hand, the combustion exhaust gas generated when the anode off gas supplied to the combustion unit 32 after passing through the anode off gas heat exchanger 42 during steady operation is combusted in the combustion unit 32, or the combustion unit 32 via the booster pump 223. The combustion exhaust gas generated when the city gas supplied to is combusted in the combustion section 32 is discharged to the outside through the combustion exhaust gas heat exchanger 45 from the second gas discharge port 59.
[0041]
According to the fuel cell power generation system 10 of the present embodiment described in detail above, the electronic control unit 60 is housed in the same main body package 10a as the high temperature part (the reformer 30, the CO selective oxidation part 34, and the off-gas combustion part 57). However, since it is arranged not adjacent to the high temperature part but spaced apart, it is difficult to be affected by the high temperature part during system operation, and it is difficult to increase the temperature. Therefore, the electronic control unit 60 can operate satisfactorily in function.
[0042]
In addition, the electronic control unit 60 includes a low temperature part (an anode offgas heat exchanger 42, a cathode offgas heat exchanger 44, a cooling water heat exchanger 46, a water tank 26, and the like disposed between the electronic control unit 60 and the high temperature part. ), It is difficult to increase the temperature even when the main body package 10a is downsized as in the present embodiment. In particular, since the anode offgas heat exchanger 42, the cathode offgas heat exchanger 44, the cooling water heat exchanger 46, and the water tank 26 are disposed in the vicinity of the electronic control unit 60, the electronic control unit 60 is more effectively shielded. Be heated.
[0043]
Furthermore, since the electronic control unit 60 is disposed so as to be substantially in contact with the right side surface of the main body package 10a opposite to the left side surface where the first and second gas discharge ports 49 and 59 are disposed, Even when the main body package 10a is downsized as in the present embodiment, it is not easily affected by exhaust gas, and can function well in terms of function.
[0044]
Furthermore, in the present embodiment, since the fuel cell 40 is disposed above the high temperature part, air warmed in the high temperature part is easily collected around the fuel cell 40 at the time of starting the system and the warm-up property is improved. .
[0045]
In addition, since the fuel cell 40 is provided with a pipe connection part 40a for gas and cooling water at one end and a power extraction part 40b at the other end, it is possible to connect the pipe and take out power in a relatively small space. It is suitable for adopting a compact package as the main body package 10a as in the form. In particular, since the power extraction portion 40b is disposed at a position where it can be easily exposed from the right side surface of the main body package 10a, the operation of connecting to the system linkage package 10c can be easily performed.
[0046]
It should be noted that the present invention is not limited to the above-described embodiment, and can of course be implemented in various forms within the scope belonging to the technical scope of the present invention.
[0047]
For example, in the embodiment described above, the off-gas combustion unit 57 is configured to burn by catalytic action, but may be configured to burn by a burner (flame).
[0048]
In the above-described embodiment, the reservoir tank 47 is disposed in front of the fuel cell 40 in the main body package 10a. However, the reservoir tank 47 is disposed at a position close to the upper portion of the electronic control unit 60, or the high-temperature section and the electronic device. It may be arranged between the control unit 60 and the like. In this way, the reservoir tank 47 can effectively shield the electronic control unit 60 from the high temperature portion.
[0049]
Furthermore, although the main body package 10a adopted in the above-described embodiment is a rectangular parallelepiped casing having a width of 700 mm, a depth of 360 mm, and a height of 900 mm, the size is not particularly limited, and a casing other than a rectangular parallelepiped ( For example, it may be a cylindrical shape) or a more compact size.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an outline of a configuration of a fuel cell power generation system.
FIG. 2 is a block diagram showing signal input / output of an electronic control unit of the fuel cell power generation system.
FIG. 3 is a cross-sectional view of a single cell constituting a fuel cell.
FIG. 4 is an explanatory diagram showing a layout of main components housed in a main body package.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 5,8 ... DC / DC converter, 6 ... Inverter, 10 ... Fuel cell power generation system, 10a ... Main body package, 10b ... Hot water storage package, 10c ... System linkage package, 22 ... Gas piping, 24 ... Desulfurizer, 25 ... Water purification , 26 ... water tank, 27 ... evaporator, 28 ... mixer, 30 ... reformer, 32 ... combustion section, 34 ... CO selective oxidation section, 40 ... fuel cell, 41 ... blower, 42 ... anode off-gas heat exchange , 43 ... cooling water circulation path, 44 ... cathode off-gas heat exchanger, 45 ... combustion exhaust gas heat exchanger, 46 ... cooling water heat exchanger, 47 ... reservoir tank, 48 ... circulation pump, 49 ... first gas outlet, DESCRIPTION OF SYMBOLS 50 ... Heat exchange medium circulation path, 51 ... Circulation pump, 52 ... Hot water storage tank, 54 ... Heat exchange medium, 410 ... Single cell, 412 ... Electrolyte membrane, 414 ... Anode, 415 ... Fuel gas supply path 416 ... cathode, 417 ... oxidizing gas supply path, 418 and 420 ... separator.

Claims (4)

A fuel cell power generation system comprising: a fuel cell that generates power by an electrochemical reaction between a fuel gas and an oxidizing gas; a control unit that controls the amount of power generated by the fuel cell; and a high-temperature unit that is at a high temperature during system operation. There,
From said control unit and the high temperature portion is spaced hand in the same package,
The control unit, the high temperature portion disposed surface on which the high-temperature portion is disposed among the packages are placed on the opposite side,
The high temperature part includes a fuel gas generation part that supplies a hydrogen rich gas obtained by a reaction between a hydrocarbon fuel and water as a fuel gas to the fuel cell,
Between the control unit and the fuel gas generation unit, a water tank that stores water for reaction in the fuel gas generation unit is adjacent to the control unit as a low temperature unit in which the temperature during system operation is low. Arranged,
Fuel cell power generation system. The fuel cell power generation system according to claim 1, wherein the fuel cell, the control unit, and the high temperature unit are housed in the same package, and the fuel cell is disposed above the high temperature unit. The fuel cell is disposed above the high temperature part and the control part, and a pipe connection part of gas and cooling water is provided at one end of the fuel cell, and a power extraction part is provided at the other end. The fuel cell power generation system described. The hot section, to any one of claims 1 to 3 including the off-gas combustion unit for combusting a fuel gas not consumed in the fuel cell the fuel cell to the fuel gas or the system during operation did not pass through the system startup The fuel cell power generation system described.

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