JP5316126B2 - Fuel cell power generator - Google Patents

Description

  The present invention relates to a fuel cell power generator including a fuel reformer, a fuel cell main body, a generated water recovery device, a heat utilization heat exchanger, and an air-cooled exhaust heat cooling device.

  In recent years, cogeneration apparatuses that use heat generated by power generation and heat generated by power generation such as hot water supply and air conditioning have been developed.

  A fuel cell power generation device, which is a type of cogeneration device, mainly includes a fuel reformer that reforms raw fuel into a fuel gas with a high hydrogen concentration, and fuel gas and air reformed by the fuel reformer. Fuel cell main body that generates electric power based on the electrochemical reaction of the above, and a water generator that recovers the exhaust gas discharged from the fuel reformer and the fuel cell main body after recovering the moisture contained in the exhaust gas And a heat-utilizing heat exchanger that causes the heat-utilizing equipment to recover the heat generated by the power generation of the fuel cell main body.

  In such a fuel cell power generation device, in order to keep the operating temperature of the fuel cell main body constant even when the heat utilization in the heat utilization facility decreases, the excess heat not recovered by the heat utilization facility is absorbed by the outside air. It is known to provide an air-cooled exhaust heat cooler for cooling.

  By the way, the exhaust gas of the fuel cell power generation device configured as described above, that is, the exhaust gas discharged to the outside from the generated water recovery unit is mostly composed of water vapor and carbon dioxide, and nitrogen oxides. It contains extremely small amounts of harmful substances such as NOx, sulfur oxide SOx, and dust, or below the detection limit value. Therefore, installation of fuel cell power generators in urban areas has been actively promoted as a cogeneration apparatus with extremely clean exhaust gas.

  On the other hand, the exhaust gas of the fuel cell power generation device contains water vapor corresponding to saturated water vapor at about 50 ° C., and when it comes into contact with the outside air, the water cooled by the outside air is condensed and white smoke is generated. For this reason, although the exhaust gas of the fuel cell power generator is extremely clean, the white smoke of the exhaust gas gives the impression that the exhaust gas is not clean, and the fuel cell power generator is installed in an urban area. There was a risk of being viewed as a problem.

  Therefore, in order to prevent the exhaust gas of the fuel cell power generator from becoming white smoke, it is known that the exhaust gas is heated and discharged to the outside after the water vapor concentration of the water vapor contained in the exhaust gas is lowered. . Specifically, an air-cooled exhaust heat cooler that cools excess heat that has not been recovered by the heat utilization facility is provided in the generated water recovery device, and the excess heat is absorbed by the exhaust gas discharged from the generated water recovery device. As a result, the exhaust gas is heated and the excess heat is cooled (for example, Patent Document 1).

JP 2002-100382 A Japanese Patent Laid-Open No. 7-169498 JP-A-8-293316 JP 2008-84828 A

  However, when the exhaust gas of the fuel cell power generation device becomes white smoke, since the temperature of the exhaust gas is higher than the temperature of the outside air, the heat absorption of the excess heat by the exhaust gas is less than the heat absorption of the excess heat by the outside air. Since the temperature difference with the recovery system hot water decreases, the cooling effect of excess heat in the air-cooled exhaust heat cooler decreases. Therefore, in order to prevent the exhaust gas from becoming white smoke, it is necessary to increase the size of the air-cooled exhaust heat cooler when the exhaust gas is heated by the excess heat of the heat recovery system hot water. When the exhaust heat cooler installation space is limited, there is a problem that the cooling effect of excess heat is reduced.

  The present invention has been made in view of the above points, and provides a fuel cell power generation device that prevents the exhaust gas from becoming white smoke without reducing the cooling effect of excess heat that has not been recovered by the heat utilization facility. For the purpose.

The fuel cell power generator of the present invention includes a fuel reformer that reforms raw fuel to generate fuel gas, a fuel cell main body that generates electric power by an electrochemical reaction between the fuel gas and reaction air, and the fuel reformer. The generated water recovery device for discharging the exhaust gas from the gas generator and the fuel cell main body after recovering the moisture contained in the exhaust gas, and the heat utilization facility to recover the heat generated by the power generation in the fuel cell main body The heat utilization heat exchanger and the excess heat that has not been recovered by the heat utilization facility are absorbed by the outside air, and the outside air that has absorbed the excess heat is mixed with the exhaust gas discharged from the generated water recovery device. An air-cooled exhaust heat cooler that discharges, and the air-cooled exhaust heat cooler is outside the housing that houses the fuel reformer, the fuel cell main body, and the generated water recovery device, and the production Installed above the water recovery unit A fuel cell power plant is, the air-cooled heat cooler, an intake port for taking in outside air, a heat exchanger for exchanging heat with the outside air taken in from the intake port and the excess heat, the An exhaust port for discharging outside air that has absorbed the excess heat by heat exchange in the heat exchanger to the outside, and the generation is performed with respect to an exhaust gas discharge area formed between the heat exchanger and the exhaust port The exhaust gas from the water recovery unit is discharged, and in the exhaust gas discharge area, the outside air that has absorbed the excess heat and the exhaust gas from the generated water recovery unit are mixed and discharged to the outside through the exhaust port. characterized in that it.

According to this configuration, in the air-cooled exhaust heat cooler, excess heat that has not been recovered by the heat utilization facility is cooled by the outside air, and the exhaust gas is heated by the outside air that has absorbed the excess heat. It is possible to prevent the exhaust gas from becoming white smoke without reducing the cooling effect. In addition, since the air-cooled exhaust heat cooler is installed outside the housing of the fuel cell power generator and above the generated water recovery device, the exhaust gas from the generated water recovery device is provided in the air-cooled exhaust heat cooler. The length of the exhaust pipe for flowing into the exhaust gas discharge area thus made can be shortened. Therefore, the pressure loss of the exhaust gas flowing through the exhaust pipe can be reduced, and the pressure loss of the exhaust gas can prevent the internal pressure of the fuel cell body and the fuel reformer inside the housing from increasing. it can. Moreover, the dew condensation water generated inside the exhaust pipe can be easily flowed down into the generated water recovery unit provided below the exhaust pipe. The air-cooled exhaust heat cooler mixes the exhaust gas discharged from the generated water recovery device and the outside air that has absorbed excess heat in an exhaust gas discharge area provided between the heat exchanger and the exhaust port. Therefore, it is possible to prevent the exhaust gas discharged from the generated water recovery device from being introduced near the intake port of the air-cooled exhaust heat cooler, and to prevent the cooling effect of excess heat from being lowered.

  In the fuel cell power generator according to the present invention, the air-cooled exhaust heat cooler includes a plurality of the exhaust ports and is formed between the heat exchanger and a part of the exhaust ports. In the first area that functions as the exhaust gas discharge area, the partition wall partitioning the area and a second area formed between the heat exchanger and another exhaust port, the excess heat is The outside air that has absorbed heat and the exhaust gas discharged from the generated water collector are mixed and discharged to the outside through the partial exhaust port.

  According to this configuration, the air-cooled exhaust heat cooler removes the exhaust gas and surplus heat discharged from the generated water recovery device in the first area provided between the heat exchanger and a part of the exhaust ports. Since the outside air that has absorbed heat is mixed and discharged to the outside through some of the exhaust ports, it is not necessary to operate the cooling fans provided at all the exhaust ports in order to prevent the exhaust gas from becoming white smoke. Therefore, it is possible to reduce the power consumption of the cooling fan to prevent the exhaust gas from becoming white smoke, and to remove excess heat from the air-cooled exhaust heat cooler depending on whether other cooling fans are operated or not. The amount of heat can be adjusted.

  According to the present invention, in the air-cooled exhaust heat cooler, the excess heat that has not been recovered by the heat utilization facility is cooled by the outside air, and the exhaust gas is heated by the outside air that has absorbed the excess heat. It is possible to prevent the exhaust gas from becoming white smoke without reducing the cooling effect.

1 is a schematic view of a fuel cell power generator according to a first embodiment of the present invention. It is the schematic of the fuel cell electric power generating apparatus which concerns on the 2nd Embodiment of this invention. It is the schematic of the fuel cell electric power generating apparatus which concerns on the 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]
FIG. 1 is a schematic diagram of a fuel cell power generator according to a first embodiment of the present invention.

  In the fuel cell power generation device 1 shown in FIG. 1, a device related to a power generation reaction process is accommodated in a housing 2, and a device for recovering heat generated in the power generation reaction process is provided outside the housing 2. Yes. Various devices constituting the fuel cell power generator 1 are connected by various pipes such as a fuel gas supply system 11, a reaction air supply system 12, a cooling water system 13, and a heat recovery system 14.

  The fuel cell main body 21 is a cooling plate that stacks single cells formed by providing an electrolyte layer between the fuel electrode 21a and the air electrode 21b, and removes heat generated by power generation each time a plurality of single cells are stacked. 21c is provided. The fuel cell main body 21 generates power and generates heat based on an electrochemical reaction between the fuel gas supplied to the fuel electrode 21a and the reaction air supplied to the air electrode 21b.

  A fuel gas supply system 11 is connected to the fuel electrode 21a of the fuel cell body 21 to supply the fuel electrode 21a with fuel gas obtained by reforming the raw fuel. The fuel gas supply system 11 is provided with a desulfurizer 22, an ejector pump 23, a fuel reformer 24, and a CO converter 25.

  The desulfurizer 22 adds hydrogen to the raw fuel, and adsorbs and removes sulfur contained in the raw fuel as an odorant. The ejector pump 23 mixes the raw fuel desulfurized by the desulfurizer 22 and the water vapor supplied from the water vapor separator 29. The fuel reformer 24 heats the raw fuel mixed with the water vapor by the ejector pump 23 under the catalyst by combustion in the combustor 24a, and generates a fuel gas having a high hydrogen concentration. The fuel reformer 24 supplies the generated fuel gas to the fuel electrode 21a via the CO converter 25.

  The combustor 24 a of the fuel reformer 24 receives the fuel off-gas system 15 for discharging the fuel electrode off-gas containing residual hydrogen from the fuel electrode 21 a to the combustor 24 a and the combustion air taken in from the combustion air blower 26. A combustion air supply system 16 for supplying to the combustor 24 a is connected, and the combustor 24 a is supplied via the fuel electrode off-gas discharged through the fuel off-gas system 15 and the combustion air supply system 16. Burn the combustion air. Further, a combustion exhaust gas system 17 for discharging combustion exhaust gas containing combustion product water generated by combustion to the product water recovery unit 27 is connected to the combustor 24a.

  The air electrode 21b of the fuel cell main body 21 is connected to a reaction air supply system 12 for supplying the reaction air taken in by the reaction air blower 28 to the air electrode 21b. The air electrode 21 b is connected to a reaction air off-gas system 18 for discharging an air electrode off-gas containing reaction product water generated by an electrochemical reaction to the product water collector 27.

  The generated water recovery unit 27 cools the combustion exhaust gas discharged through the fuel exhaust gas system 17 and the air electrode off gas discharged through the reaction air off gas system 18 by heat exchange with cold water, The reaction product water is recovered. Further, an exhaust cylinder 27a is connected above the product water recovery device 27, and an exhaust gas composed of combustion exhaust gas from which combustion product water is recovered and an air electrode off-gas from which reaction product water is recovered, It is discharged through the exhaust cylinder 27a.

  A cooling water system 13 that circulates battery cooling water for cooling the fuel cell main body 21 is incorporated in the cooling plate 21 c of the fuel cell main body 21. In the cooling plate 21 c, the fuel cell body 21 is cooled by absorbing the heat of the fuel cell body 21 with the battery cooling water flowing through the cooling water system 13. The cooling water system 13 is provided with a water vapor separator 29, a cooling water pump 30, and a cooling water cooler 31.

  The water vapor separator 29 separates the battery cooling water flowing through the cooling water system 13 as a gas-liquid two-phase flow into water vapor and battery cooling water. The separated battery cooling water is supplied to the cooling plate 21 c of the fuel cell main body 21 by the cooling water pump 30, and the separated water vapor is supplied to the ejector pump 23. Further, in order to compensate for the amount of water that is reduced by the supply of water vapor to the ejector pump 23, the water separator 29 after the generated water supplied from the recovered water recovery device 27 by the recovered water pump 32 has been blunted by the water treatment device 33. To be supplied.

  The cooling water cooler 31 incorporates a heat recovery system 14 that circulates heat recovery cooling water that recovers the heat of the fuel cell main body 21. In the cooling water cooler 31, the heat of the battery cooling water is recovered in the heat recovery cooling water by heat exchange between the battery cooling water flowing through the cooling water system 13 and the heat recovery cooling water flowing through the heat recovery system 14. The battery cooling water is cooled. The cooled battery cooling water is supplied again to the cooling plate 21 c of the fuel cell main body 21 through the cooling water system 13.

  The heat recovery system 14 is provided with a heat recovery pump 34, a heat utilization heat exchanger 35, and an air-cooled exhaust heat cooler 36. The heat recovery pump 34 supplies the heat recovery cooling water whose heat has been recovered in the cooling water cooler 31 to the heat-use heat exchanger 35.

  In the heat-use heat exchanger 35, heat-recovery cooling water is exchanged by heat exchange between heat-recovery cooling water supplied from the heat-recovery pump 34 and heat-use equipment (not shown) such as a water heater or air conditioner. The heat is recovered, and the recovered heat is used by the heat utilization equipment. In addition, the heat-use heat exchanger 35 uses an air-cooled exhaust heat cooler 36 to cool the heat-recovery cooling water in order to cool excess heat that has not been recovered by the heat-use facility due to a decrease in heat use in the heat-use facility. To supply.

  A heat recovery system 14 is incorporated in the air-cooled exhaust heat cooler 36, and heat exchange between the heat recovery cooling water flowing through the heat recovery system 14 and the outside air taken into the air-cooled exhaust heat cooler 36 is performed. A heat exchanger 36d for performing is provided. By this heat exchange, heat of the heat recovery cooling water flowing through the heat recovery system 14, that is, excess heat that has not been recovered by the heat utilization facility is absorbed by the outside air, and the heat recovery cooling water is cooled. The cooled cooling water for heat recovery is supplied again to the cooling water cooler 31 through the heat recovery system 14.

  In addition, the air-cooled exhaust heat cooler 36 is installed at the top of the housing 2 and is preferably installed at a position above or near the generated water recovery unit 27. One or more intake ports 36a are provided on the bottom surface of the air-cooled exhaust heat cooler 36, and exhaust ports are provided on the top surface of the air-cooled exhaust heat cooler 36 at positions facing the one or more intake ports 36a, respectively. 36b is provided. Further, near one or more exhaust ports 36b, there is a cooling fan 36c for taking outside air from the intake port 36a and exhausting outside air that has absorbed excess heat by heat exchange in the heat exchanger 36d from the exhaust port 36b. Provided.

  Further, an exhaust gas discharge area 36e is formed between the heat exchanger 36d and the exhaust port 36b provided on the upper surface. An exhaust cylinder 27a through which the exhaust gas from the generated water recovery unit 27 flows is connected to a side surface between the heat exchanger 36d and the exhaust port 36b where the exhaust gas discharge area 36e is formed.

  Next, the excess heat cooling operation and the exhaust gas discharging operation in the fuel cell power generator 1 according to the first embodiment configured as described above will be described.

  Heat recovery cooling water that retains excess heat that has not been recovered by the heat utilization facility due to a decrease in heat utilization in the heat utilization facility is passed from the heat utilization heat exchanger 35 to the air-cooled exhaust heat cooler 36 through the heat recovery system 14. To be supplied.

  In the air-cooled exhaust heat cooler 36, the outside air taken in from the air inlet 36a provided on the bottom surface absorbs excess heat by heat exchange with the heat recovery cooling water in the heat exchanger 36d by the cooling fan 36c. . The outside air that has absorbed the excess heat is discharged to the outside through the exhaust gas discharge area 36e by the cooling fan 36c through the exhaust port 36b. At this time, in the exhaust gas discharge area 36e, the exhaust gas discharged through the exhaust tube 27a is mixed and diluted with the outside air that has absorbed excess heat, and then discharged to the outside through the exhaust port 36b.

  That is, surplus heat that has not been recovered by the heat utilization facility due to a decrease in heat utilization in the heat utilization facility is absorbed by the outside air taken in from the intake port 36a, thereby preventing the cooling effect of the excess heat from deteriorating. Can do. Further, since the exhaust gas discharged to the exhaust gas discharge area 36e through the exhaust cylinder 27a is heated by being mixed and diluted with the outside air that has absorbed excess heat, the water vapor concentration of the water vapor contained in the exhaust gas is reduced. be able to. Therefore, when the exhaust gas from the generated water recovery device 27 is discharged to the outside, it is possible to prevent the exhaust gas from becoming white smoke due to condensation of moisture cooled by the outside air.

  As described above, according to the fuel cell power generation device 1 according to the first embodiment, in the air-cooled exhaust heat cooler 36, the excess heat that has not been recovered by the heat utilization facility is cooled by the outside air and the exhaust gas. Is heated by the outside air that has absorbed the excess heat, so that it is possible to prevent the exhaust gas from becoming white smoke without reducing the cooling effect of the excess heat.

  Further, according to the fuel cell power generator 1 according to the first embodiment, the air-cooled exhaust heat cooler 36 is located at the top of the casing 2 of the fuel cell power generator 1, particularly above the generated water collector 27. Alternatively, the length of the exhaust cylinder 27a through which the exhaust gas from the generated water recovery unit 27 flows to the exhaust gas discharge area 36e provided in the air-cooled exhaust heat cooler 36 can be shortened. it can. Therefore, the pressure loss of the exhaust gas flowing through the exhaust cylinder 27a can be reduced, and the internal pressure of the fuel cell main body 21 and the fuel reformer 24 in the housing 2 increases due to the pressure loss of the exhaust gas, or the combustion air It is possible to prevent the power of the blower 26 and the reaction air blower 28 from increasing. Further, the dew condensation water generated inside the exhaust cylinder 27 a can be easily flowed down to the recovered water tank in the generated water recovery device 27 provided below the exhaust cylinder 27.

  Further, according to the fuel cell power generator 1 according to the first embodiment, the air-cooled exhaust heat cooler 36 is generated in the exhaust gas discharge area 36e provided between the heat exchanger 36d and the exhaust port 36b. In order to mix the exhaust gas discharged from the water recovery unit 27 and the outside air that has absorbed excess heat, the exhaust gas discharged from the generated water recovery unit 27 is introduced near the intake port 36a of the air-cooled exhaust heat cooler 36. It can prevent that the cooling effect of excess heat falls.

  Furthermore, according to the fuel cell power generation device 1 according to the first embodiment, the more the excess heat that has not been recovered in the heat utilization facility due to the decrease in heat utilization in the heat utilization facility, the more air-cooled exhaust heat cooling is performed. In the vessel 36, the temperature of the exhaust gas that is mixed and diluted with the outside air that has absorbed the excess heat and discharged to the outside increases, so that the whitening of the exhaust gas can be more effectively prevented.

[Second Embodiment]
FIG. 2 is a schematic diagram of a fuel cell power generator according to a second embodiment of the present invention. The same parts as those of the fuel cell power generator according to the first embodiment shown in FIG.

  In the fuel cell power generation device 3 according to the second embodiment, a plurality of intake ports 36 a are provided on the bottom surface of the air-cooled exhaust heat cooler 36, and a plurality of intake air is provided on the top surface of the air-cooled exhaust heat cooler 36. Exhaust ports 36b are respectively provided at positions facing the ports 36a. Further, near each exhaust port 36b, there is provided a cooling fan 36c for discharging outside air taken in from the intake port 36a provided at a position facing each exhaust port 36b from each exhaust port 36b.

  A first area functioning as an exhaust gas discharge area 36e is formed between the heat exchanger 36d and a part of the exhaust ports 36b provided on the upper surface, and the heat exchanger 36d and the other exhaust ports 36b are connected to each other. A second area is formed between them. The first area and the second area are partitioned by a partition wall 36f. Further, exhaust gas from the generated water recovery device 27 is placed on the side surface between the exhaust gas discharge area 36e, that is, the heat exchanger 36d in which the first area is formed, a part of the exhaust ports 36b, and the partition wall 36f. An exhaust pipe 27a that flows is connected.

  Next, the excessive heat cooling operation and the exhaust gas discharging operation in the fuel cell power generation device 3 according to the second embodiment configured as described above will be described.

  In the air-cooled exhaust heat cooler 36, the outside air taken in from the intake port 36a provided on the bottom surface by each cooling fan 36c absorbs excess heat by heat exchange with the heat recovery cooling water in the heat exchanger 36d. .

  Part of the outside air that has absorbed the excess heat is exhausted to the outside through a part of the exhaust ports 36b through the first area, that is, the exhaust gas discharge area 36e, by a part of the cooling fans 36c. At this time, in the exhaust gas discharge area 36e, the exhaust gas discharged through the exhaust tube 27a is mixed and diluted with a part of the outside air that has absorbed excess heat, and then discharged to the outside through a part of the exhaust ports 36b.

  Further, the remaining outside air that has absorbed the excess heat is discharged to the outside from the other exhaust port 36b by the other cooling fan 36c without passing through the exhaust gas discharge area 36e. That is, the remainder of the outside air that has absorbed the excess heat is discharged from the other exhaust port 36b to the outside without being mixed with the exhaust gas discharged through the exhaust cylinder 27a.

  In this way, the exhaust gas discharged through the exhaust cylinder 27a into the exhaust gas discharge area 36e partitioned by the partition wall 36f is mixed and diluted with the outside air that has absorbed excess heat by the cooling fan 36c and heated. Therefore, it is not necessary to operate the cooling fans provided in all the exhaust ports 36b in order to prevent the exhaust gas from becoming white smoke. Accordingly, the number of cooling fans 36c for preventing the exhaust gas from becoming white smoke can be reduced to save power, and air-cooled exhaust heat cooling is performed depending on whether or not the other cooling fans 36c are operated. The amount of heat removed from the surplus heat of the vessel 36 can be adjusted.

  For example, when the fuel cell power generation device 3 is installed in the winter or in a cold region, that is, when the heat utilization in the heat utilization facility increases and the excess heat not recovered in the heat utilization facility decreases, white smoke is generated. For prevention, it is possible to control the number of units that operate only some of the cooling fans 36c installed in the exhaust gas discharge area 36e partitioned by the partition wall 36f and stop the other cooling fans 36c. In this case, by stopping the other cooling fan 36c, it is possible to reduce the power consumption of the air-cooled exhaust heat cooler 36 and to reduce the heat removal amount of excess heat.

  As described above, according to the fuel cell power generation device 3 according to the second embodiment, it is not necessary to operate the cooling fans 36c provided in all the exhaust ports 36b in order to prevent the exhaust gas from becoming white smoke. Further, it is possible to reduce the power consumption of the cooling fan 36c for preventing the exhaust gas from becoming white smoke, and surplus heat of the air-cooled exhaust heat cooler 36 depending on whether or not the other cooling fan 36c is operated. The amount of heat removal can be adjusted.

[Third Embodiment]
FIG. 3 is a schematic diagram of a fuel cell power generator according to a third embodiment of the present invention. The same parts as those of the fuel cell power generator according to the first embodiment shown in FIG.

  In the fuel cell power generation device 4 according to the third embodiment, the outlet of the exhaust cylinder 27 a through which the exhaust gas from the generated water recovery device 27 flows is provided near the intake port 36 a of the air-cooled exhaust heat cooler 36. .

  In the fuel cell power generation device 4 configured as described above, in the air-cooled exhaust heat cooler 36, the outside air and the exhaust gas discharged through the exhaust cylinder 27a are mixed and diluted by the cooling fan 36c and provided on the bottom surface. The air intake 36a is taken in. The outside air and the exhaust gas taken in from the intake port 36a absorb excess heat by heat exchange with the heat recovery cooling water in the heat exchanger 36d, and then are discharged from the exhaust port 36b to the outside by the cooling fan 36c.

  According to the fuel cell power generation device 4 according to the third embodiment, the outlet of the exhaust cylinder 27 a through which the exhaust gas from the generated water recovery unit 27 flows is provided near the intake port 36 a of the air-cooled exhaust heat cooler 36. Thus, the length of the exhaust tube 27a can be further shortened. Therefore, the pressure loss of the exhaust gas flowing through the exhaust cylinder 27a can be reduced, and various problems caused by the pressure loss of the exhaust gas can be prevented more efficiently.

  In the first and second embodiments, the exhaust cylinder 27a through which the exhaust gas from the generated water recovery unit 27 flows is connected to the side surface between the heat exchanger 36d and the exhaust port 36b where the exhaust gas discharge area 36e is formed. As described above, for example, the outlet of the exhaust tube 27a is configured to be provided above the exhaust port 36b of the air-cooled exhaust heat cooler 36, and the outside air that has absorbed excess heat and the exhaust tube 27a. The exhaust gas discharged from the exhaust gas may be mixed and diluted outside the exhaust port 36b.

DESCRIPTION OF SYMBOLS 1, 3, 4 ... Fuel cell power generation device 2 ... Housing 11 ... Fuel gas supply system 12 ... Reaction air supply system 13 ... Cooling water system 14 ... Heat recovery system 15 ... Fuel off gas system 16 ... Combustion air supply system 17 ... Combustion exhaust gas system DESCRIPTION OF SYMBOLS 18 ... Reaction air off gas system 21 ... Fuel cell main body 21a ... Fuel electrode 21b ... Air electrode 21c ... Cooling plate 22 ... Desulfurizer 23 ... Ejector pump 24 ... Fuel reformer 24a ... Combustor 25 ... CO converter 26 ... Combustion air Blower 27 ... Generated water recovery device 27a ... Exhaust tube 28 ... Reaction air blower 29 ... Steam separator 30 ... Cooling water pump 31 ... Cooling water cooler 32 ... Recovery water pump 33 ... Water treatment device 34 ... Heat recovery pump 35 ... Heat-utilizing heat exchanger 36 ... Air-cooled exhaust heat cooler 36a ... Intake port 36b ... Exhaust port 36c ... Cooling fan 36d ... Heat exchanger 36e ... Exhaust gas discharge area 36f ... Partition wall

Claims (2)

A fuel reformer that reforms raw fuel to generate fuel gas, a fuel cell body that generates electric power by an electrochemical reaction between the fuel gas and reaction air, and the fuel reformer and the fuel cell body A generated water recovery device that discharges exhaust gas after recovering moisture contained in the exhaust gas, a heat-use heat exchanger that recovers heat generated by power generation in the fuel cell body to a heat-use facility, and the heat An air-cooled exhaust heat cooler that absorbs excess heat that has not been recovered by the use equipment by outside air, and that mixes and discharges the outside air that has absorbed the excess heat and the exhaust gas discharged from the generated water recovery device. And the air-cooled exhaust heat cooler is installed outside the housing housing the fuel reformer, the fuel cell main body, and the generated water recovery device, and above the generated water recovery device. fuel cell power plant der that Te,
The air-cooled exhaust heat cooler is
An intake port for taking in outside air, a heat exchanger for exchanging heat between the outside air taken from the intake port and the excess heat, and the outside air that has absorbed the excess heat by heat exchange in the heat exchanger is discharged to the outside. An exhaust port,
The exhaust gas is discharged from the generated water recovery device to an exhaust gas discharge area formed between the heat exchanger and the exhaust port, and outside air that has absorbed the excess heat in the exhaust gas discharge area; A fuel cell power generator characterized in that the exhaust gas from the generated water recovery unit is mixed and discharged to the outside through the exhaust port . The air-cooled exhaust heat cooler is
A second area formed between the heat exchanger and another exhaust port, and a first area formed between the heat exchanger and a part of the exhaust ports. And having a partition wall
In the first area functioning as the exhaust gas discharge area, the outside air that has absorbed the surplus heat and the exhaust gas discharged from the generated water recovery unit are mixed, and the external exhaust gas is discharged from the partial exhaust port to the outside. The fuel cell power generator according to claim 1 , wherein the fuel cell power generator is discharged.

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