JP4976434B2 - Fuel cell system - Google Patents

Abstract

A fuel cell system (100) has a hydrogen production device (12), a combustor (13), an air feeding device (14) for the combustor, a fuel cell (15), an oxidation agent gas feeding device (16), and a housing (11). In the fuel cell system (100), an air intake opening (17) for the combustor, belonging to the air feeding device (14), a combustion gas discharge opening (18) for discharging a combustion gas of the combustor (13) to the air, and an excess oxidation agent gas discharge opening (19) for discharging an excess oxidation agent gas to the air are formed on the same surface (31) of the housing (11).

Description

  The present invention relates to a fuel cell system. In particular, a hydrogen generating device that reforms a raw material into a hydrogen-rich fuel gas by heating, a combustor that burns a combustible gas using air to heat the hydrogen generating device, and the air to the combustor The present invention relates to a fuel cell system comprising: a combustor air supply device to be supplied; a fuel cell that generates power using the fuel gas and oxidant gas; and an oxidant gas supply device that supplies the oxidant gas to the fuel cell. .

  A conventional fuel cell system includes, for example, a hydrogen generator that reforms a raw material into a hydrogen-rich fuel gas by heating, a combustor that burns a combustible gas using air and heats the hydrogen generator, A combustor air supply device that supplies the air to the combustor; a fuel cell that generates power using the fuel gas and the oxidant gas; and an oxidant gas supply device that supplies the fuel cell with an oxidant gas; It is comprised. As for the exhaust of the combustion exhaust gas, the surplus oxidant gas, and the intake of the combustor air, the operation of the fuel cell system is hindered if the intake and exhaust of the exhaust gas are disturbed. Therefore, special consideration is required for the formation of the intake / exhaust port provided in the fuel cell system, and various improvements are made for the purpose of improving the safety related to intake / exhaust of the fuel cell system or performing intake / exhaust efficiently. Proposals have been made.

  For example, in Patent Document 1, since the discharge of relatively high-temperature combustion exhaust gas diffuses upward in the atmosphere, the combustion exhaust gas is discharged from the upper surface of the package (housing) of the fuel cell system, and the oxidant gas of the fuel cell A fuel cell device has been proposed in which air is sucked from a side surface or a lower surface of a housing. In addition, from the viewpoint of safety regarding the exhausted gas, a fuel cell power generation device that mixes and exhausts combustion exhaust gas and excess oxidant gas (air off gas) has been proposed.

  Further, in Patent Document 2, a fuel cell power supply device in which a fuel cell, a reformer, and the like are accommodated in an outer box, and a discharge port for combustion exhaust gas and an air intake port are provided in the outer box at positions separated from each other. Has been proposed.

Further, Patent Document 3 discloses a fuel cell power generation system configured to take in air from the side surface of the housing and discharge combustion exhaust gas from the upper surface of the housing in FIG. In addition, this fuel cell power generation system is configured to allow air to flow between the side surfaces of the housing located at positions opposite to each other by the ventilation fan. Patent Document 4 discloses a fuel cell power generator that introduces air into a housing by a ventilation fan or an air blower.
JP 2003-217637 A JP 2002-175820 A JP 2002-329515 A Japanese Patent Laid-Open No. 7-6777

  However, when the fuel cell system is installed outdoors at the position where the intake and exhaust ports of the conventional fuel cell system are formed, the amount of air supplied by the air supply device fluctuates during strong winds, causing the combustor to cause incomplete combustion or misfire. There was a case.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fuel cell system that suppresses incomplete combustion and misfire of a combustor of the fuel cell system.

  As a result of intensive research to achieve the above object, the inventors of the present invention have found that the combustor air-supply device hits the combustor air intake port of the combustor air-supply device that sucks air from the atmosphere, and the combustion exhaust gas. It has been found that excessive air is sent to the combustor and the combustor tends to misfire in a state where strong wind does not hit the combustion exhaust gas discharge port of the combustor that discharges the air into the atmosphere. On the contrary, when strong wind hits the combustion exhaust gas outlet and strong wind does not hit the combustor air intake port, back pressure is applied to the combustion exhaust gas exhaust port, the air supply to the combustor is delayed, and the combustor It has been found that incomplete combustion tends to occur. Therefore, it was found that if the air intake port for the combustor and the exhaust gas exhaust port are formed on the same surface, the same wind hits both in the case of a strong wind, and thus misfire or incomplete combustion as described above is suppressed. .

  However, the inventor has found that the combustor air intake port and the combustion exhaust gas discharge port are formed on the same surface, so that the combustion exhaust gas flows into the combustion air intake port and the combustor burns incompletely. I thought that would occur. On the other hand, in the fuel cell system, excess oxidant gas is discharged from the fuel cell. Therefore, the inventor has found that the above-described adverse effects can be suppressed by utilizing this surplus oxidant gas.

  Based on these examination results, in order to solve the above problems, the fuel cell system of the first aspect of the present invention includes a hydrogen generator that reforms a raw material into a hydrogen-rich fuel gas by heating, and combustible air. A combustor that burns a property gas to heat the hydrogen generator; a combustor air supply device that supplies the air to the combustor; and a fuel cell that generates power using the fuel gas and oxidant gas; An oxidant gas supply device for supplying the oxidant gas to the fuel cell, a hydrogen generating device, the combustor, a combustor air supply device, the fuel cell, and a polyhedral housing for housing the oxidant gas supply device A combustor air intake port of the combustor air supply device for sucking the air, a combustion exhaust gas exhaust port for discharging the combustion exhaust gas of the combustor to the atmosphere, and a surplus Wherein the oxidizing agent gas and the excess oxidizing gas discharge port for release to the atmosphere, are formed on the same surface of the housing. By adopting such a configuration, the combustor air intake port and the combustion exhaust gas discharge port are formed on the same surface, so that misfire or incomplete combustion of the combustor during strong winds can be suppressed. Moreover, since the combustion exhaust gas discharge port and the surplus oxidant gas discharge port are formed on the same surface, the combustion exhaust gas and the surplus oxidant gas are easily mixed. Therefore, since the oxidant gas flows into the combustion air intake port together with the combustion exhaust gas, incomplete combustion of the combustor due to the inflow of the combustion exhaust gas into the combustion air intake port can be suppressed. By these effects, incomplete combustion and misfire of the combustor of the fuel cell system can be suppressed after all. Here, “formed on the same surface” means to include a structure formed in the vicinity of the same surface within the range where the above-described effects are exhibited.

  In the fuel cell system of the second aspect of the present invention, the air intake port for the combustor and the integrated exhaust port for discharging the combustion exhaust gas and the surplus oxidant gas together into the atmosphere are formed on the same surface. Good. With this configuration, since the combustion exhaust gas is mixed with the surplus oxidant gas and discharged at the integrated exhaust port, the intake of the combustion exhaust gas from the combustor air intake port can be further suppressed, and the combustion of the fuel cell system Incomplete combustion and misfire of the vessel can be suppressed more reliably. Further, since the combustion exhaust gas and the surplus oxidant gas are merged, the exhaust pressure at the integrated discharge port is increased, and the resistance to the wind pressure at the integrated discharge port can be improved. Therefore, the misfire or incomplete combustion of the combustor during a strong wind can be more reliably suppressed.

  In the fuel cell system of the third aspect of the present invention, the combustor air inlet, the combustion exhaust gas outlet, and the surplus oxidant gas outlet may be formed in the same direction. With this configuration, it is possible to further reduce the influence of pressure fluctuations caused by strong wind on the intake air at the combustor air intake port and the exhaust gas at the combustion exhaust gas exhaust port and the surplus oxidant gas exhaust port. Incomplete combustion can be further suppressed. Here, “formed in the same direction D” means to include a configuration in which they are formed in substantially the same direction within a range in which the influence of pressure fluctuation due to strong winds can be further reduced. In the fuel cell system of the fourth aspect of the present invention, the combustor air inlet and the integrated outlet may be formed in the same direction. If comprised in this way, since the air intake port for combustors and the integrated discharge port are formed toward the same direction, misfire or incomplete combustion of the combustor during strong winds can be further suppressed.

  In the fuel cell system of the fifth aspect of the present invention, the same surface may be a substantially vertical surface, and the same direction may be a substantially horizontal direction. If comprised in this way, since the penetration | invasion of rain water from upper direction, the penetration | invasion of dust etc. from the downward direction can be suppressed, incomplete combustion and misfire of the combustor of a fuel cell system can be suppressed more reliably. .

  In the fuel cell system of the sixth aspect of the present invention, the combustor air inlet may be formed at a position below the combustion exhaust gas outlet. With this configuration, since the combustion exhaust gas is hotter than the atmosphere and diffuses upward, the intake of the combustion exhaust gas from the air inlet for the combustor can be suppressed, and the combustor of the fuel cell system Incomplete combustion and misfire can be more reliably suppressed.

  A fuel cell system according to a seventh aspect of the present invention has an air intake duct connected to the air supply device for the combustor, and the air intake port for the combustor is formed at an upstream end portion in the air flow direction of the air intake duct. The air suction duct may have an ascending slope or an ascending step in the air flow direction. If comprised in this way, the penetration | invasion to the air supply apparatus for combustion of the water droplet by a rainstorm or a snowstorm can be suppressed.

  The fuel cell system according to an eighth aspect of the present invention includes a combustion exhaust gas duct through which the combustion exhaust gas flows, and the combustion exhaust gas discharge port is formed at a downstream end of the combustion exhaust gas duct in the combustion exhaust gas distribution direction. The duct may have a downward slope or a downward step in the flow direction of the combustion exhaust gas. If comprised in this way, the penetration | invasion to the flow path of the combustion exhaust gas of the water droplet by a rainstorm or a snowstorm, for example, the inside of a hydrogen generator, can be suppressed.

  A fuel cell system according to a ninth aspect of the present invention has a surplus oxidant gas duct through which the surplus oxidant gas flows, and the surplus oxidant gas exhaust at a downstream end of the surplus oxidant gas duct in the surplus oxidant gas flow direction. An outlet is formed, and the excess oxidant gas duct may have a downward slope or a downward step in the flow direction of the excess oxidant gas. If comprised in this way, the penetration | invasion to the surplus oxidant gas flow path by the rain and a snowstorm can be suppressed.

  A fuel cell system according to a tenth aspect of the present invention includes an air intake duct connected to the combustor air supply device, and the air intake port for the combustor is formed at an upstream end portion in the air flow direction of the air intake duct. In addition, a sound absorbing portion may be formed in the air suction duct. With this configuration, noise generated in the fuel cell system, such as driving sound of the combustor air supply device, can be prevented, and the quietness of the fuel cell system can be improved.

  A fuel cell system according to an eleventh aspect of the present invention includes a combustion exhaust gas duct through which the combustion exhaust gas flows, and the combustion exhaust gas discharge port is formed at a downstream end of the combustion exhaust gas duct in the combustion exhaust gas distribution direction. A sound absorbing part may be formed in the duct. If comprised in this way, since the noise generated in the fuel cell system such as combustion noise in the combustor can be prevented, the quietness of the fuel cell system can be improved.

  A fuel cell system according to a twelfth aspect of the present invention includes a surplus oxidant gas duct through which the surplus oxidant gas flows, and the surplus oxidant gas exhaust at a downstream end portion of the surplus oxidant gas duct in the flow direction of the surplus oxidant gas. An outlet is formed, and a sound absorbing portion is preferably formed in the surplus oxidant gas duct. With this configuration, noise generated in the fuel cell system such as surplus oxidant gas circulation sound can be prevented, and the quietness of the fuel cell system can be improved.

  A fuel cell system according to a thirteenth aspect of the present invention is the fuel cell air supply device in which the oxidant gas supply device supplies air to the fuel cell, and the fuel cell air intake port of the fuel cell air supply device Are preferably formed on the same surface. With this configuration, the oxidant gas intake port and the surplus oxidant gas discharge port are formed on the same surface, so that fluctuations in the oxidant gas flow rate during strong winds can be suppressed. That is, the stability during operation of the fuel cell system can be improved.

  A fuel cell system according to a fourteenth aspect of the present invention is the fuel cell air supply device in which the oxidant gas supply device supplies air to the fuel cell, wherein the fuel cell air intake port of the fuel cell air supply device However, it may be formed on a surface different from the same surface. With this configuration, the oxidant gas intake port and the surplus oxidant gas discharge port are formed on different surfaces, so that intake of combustion exhaust gas from the oxidant gas intake port can be suppressed. That is, the stability during operation of the fuel cell system can be improved.

  A fuel cell system according to a fifteenth aspect of the present invention is the fuel cell air supply device in which the oxidant gas supply device supplies air to the fuel cell, and the fuel cell air intake port of the fuel cell air supply device However, it is preferable that the housing is formed in the housing, and at least one outside air circulation hole is formed in the housing at a position below the combustion exhaust gas discharge port. With this configuration, since the combustion exhaust gas diffuses upward, the inflow of the combustion exhaust gas from the outside air circulation hole into the housing can be suppressed, and the fuel cell air supply device can be used for a special fan or blower. Without using a ventilator, the inside of the housing is ventilated, and stagnation of combustible gases such as raw materials and fuel gas in the housing is suppressed, so that the fuel cell system can be simplified and the safety can be improved.

  In the fuel cell system of the sixteenth aspect of the present invention, the same surface is a surface having the largest area among the surfaces of the housing, and the combustion exhaust gas discharge port, the combustor air intake port, and the surplus oxidant gas discharge port The distance between the combustion exhaust gas outlet and the combustor air inlet may be longer than the distance between the surplus oxidant gas outlet and the combustion exhaust gas outlet. With this configuration, exhausted exhaust gas and oxidant gas are diffused in the atmosphere, so that it is possible to suppress inhalation of exhaust gas discharged further away from the combustor air intake port. Incomplete combustion and misfire of the combustor can be more reliably suppressed.

  The above object, other objects, features, and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings.

  As described above, the fuel cell system of the present invention has an effect of suppressing incomplete combustion and misfire of the combustor of the fuel cell system.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic diagram showing the basic configuration of the first embodiment of the fuel cell system of the present invention.

  First, the configuration of the fuel cell system 100 of the present embodiment will be described.

  In the fuel cell system 100, a raw material channel 1 and a water channel 2 are connected to a hydrogen generator 12. Here, hydrocarbon fuels such as natural gas, propane gas, and gasoline are used as raw materials.

  Although not shown, the hydrogen generator 12 includes at least a reformer, and preferably includes a reformer and a transformer, or a reformer, a transformer, and a purifier. The reformer is a reactor that reforms a raw material mainly composed of hydrocarbon into a hydrogen-rich gas by a steam reforming reaction. Various catalysts can be used as the catalyst for proceeding the reforming reaction, but ruthenium is preferably used. The reformer is heated by the heat of the combustor 13 and water used for the steam reforming reaction is vaporized. The specific heating temperature varies depending on the type of catalyst, but in the case of a generally used catalyst such as ruthenium, it is around 600 ° C. The shifter is a reactor in which shift reaction proceeds by catalytic action in the fuel gas generated by the reformer. A noble metal catalyst is used as the catalyst. The transformer is temperature-adjusted by temperature adjusting means such as a cooling fan (not shown). The purifier is a reactor that selectively oxidizes carbon monoxide of fuel gas by the action of a carbon monoxide selective oxidation catalyst. Ruthenium and platinum are used as the carbon monoxide selective oxidation catalyst. The carbon monoxide selective oxidizer is adjusted to the operating temperature by a heater and a cooling means (not shown).

  The hydrogen generator 12 is connected to a fuel gas passage 3 through which the fuel gas generated by the hydrogen generator 12 circulates. The fuel gas passage 3 is a fuel gas passage (hereinafter referred to as a fuel gas passage) formed inside the fuel cell 15. , Anode flow path) 15a. The anode flow path 15a is formed so as to communicate with the anode electrode on the way. Here, the fuel gas channel 3 refers to a channel through which fuel gas flows from the hydrogen generator 12 to the fuel cell 15. That is, the fuel gas channel 3 is configured not only by a single pipe line but also by all or part of the components of the fuel cell system 100. For example, although not shown, a part of the fuel gas flow path 3 is constituted by a heater, a humidifier, a bypass flow path used when starting the fuel cell 15 or purging operation, and the like.

  On the other hand, an oxidant gas flow path 6 is connected to an inlet of an oxidant gas flow path (hereinafter referred to as a cathode flow path) 15 b formed inside the fuel cell 15. The cathode channel 15b is formed so as to communicate with the cathode electrode on the way. An oxidant gas supply device 16 is connected to the end of the oxidant gas flow path 6. Here, the oxidant gas supply device is a fuel cell air supply device (hereinafter referred to as an FC air supply device) 16. A blower is used for the FC air supply device 16. That is, air is used as the oxidant gas. As a result, air is supplied to the cathode flow path of the fuel cell 15 as an oxidant gas, that is, a cathode gas. The oxidant gas may be purified air from which corrosive components and dust are removed, or oxygen gas and prepared oxidant gas. In this case, the oxidant gas is supplied from the outside. It may be configured as follows.

  The surplus oxidant gas channel 5 is connected to the outlet of the cathode channel 15b of the fuel cell 15, and the surplus oxidant gas is connected to the end of the surplus oxidant gas channel 5 on the downstream side in the flow direction of the surplus oxidant gas. A discharge port 19 is formed. As a result, the surplus oxidant gas is surplus oxidant gas, here surplus air flowing from the cathode flow path 15b of the fuel cell 15 is discharged into the atmosphere at the surplus oxidant gas discharge port 19. Here, the oxidant gas flow path 6 refers to a flow path through which oxidant gas flows from the oxidant gas supply means 16 to the fuel cell 15. The surplus oxidant gas channel 5 is a channel through which surplus oxidant gas flows until the surplus oxidant gas is discharged from the fuel cell 15 into the atmosphere. That is, the oxidant gas flow path 6 and the surplus oxidant gas flow path 5 are configured not only by a single pipe line but also by all or part of the components of the fuel cell system 100. For example, although not shown, a total heat exchanger in which the oxidant gas flow path 6 and the surplus oxidant gas flow path 5 exchange heat and moisture, a bypass flow path used when starting the fuel cell 15 or purging, etc. Thus, a part of the oxidant gas channel 6 and the surplus oxidant gas channel 5 is configured.

  Further, the surplus fuel gas channel 4 is connected to the outlet of the anode channel 15 a of the fuel cell 15, and the surplus fuel gas channel 4 is connected to the combustor 13. Thereby, the surplus fuel gas can be used as fuel for the combustor 13. Here, the surplus fuel gas channel 4 is a channel through which surplus fuel gas from the fuel cell 15 to the combustor 13 flows. That is, the surplus fuel gas flow path 4 is configured not only by a single pipe line but also by all or part of the constituent elements of the fuel cell system 100. For example, although not shown, a part of the surplus fuel gas passage 4 is configured by a bypass passage, a total heat exchanger, and the like that are used when the fuel cell 15 is started or purged.

  A combustor air supply device (B air supply device) 14 is connected to the combustor 13. As a result, in the combustor 13, the air sucked from the air inlet 17 of the combustor air supply device 14 and the surplus fuel reformed gas, or a combustible gas supplied from the raw material or other external source (not shown). Burned. The heat generated in the combustor 13 is supplied to the hydrogen generator 12. A sirocco fan is used for the B air supply device 14. A flame burner is used for the combustor 13.

  A combustion exhaust gas flow path 7 is connected to the combustor 13, and a combustion exhaust gas discharge port 18 is formed at an end of the combustion exhaust gas flow path 7 on the downstream side in the flow direction of the combustion exhaust gas. As a result, the combustion exhaust gas generated in the combustor 13 passes through the combustion exhaust gas passage 7 and is discharged into the atmosphere at the combustion exhaust gas outlet 18. Here, the combustion exhaust gas passage 7 refers to a passage through which the combustion exhaust gas flows from the combustor 13 until the combustion exhaust gas is discharged into the atmosphere. That is, the combustion exhaust gas flow path 7 is not only a single pipe line but also all or a part thereof is configured by the components of the fuel cell system 100. For example, as shown in the figure, the majority of the combustion exhaust gas flow path 7 is configured in the hydrogen generator 12 here.

  The hydrogen generator 12, the combustor 13, the B air supply device 14, the fuel cell 15, and the FC air supply device 16 are accommodated in the housing 11. The housing 11 is a polyhedron having a plurality of surfaces. In general, the housing 11 is a hexahedron having a bottom plate or a pentahedron having no bottom plate. Further, the surface of the housing 11 is not limited to a flat surface, and may be a curved surface.

  Here, the combustor air intake port 17, the combustion exhaust gas discharge port 18, and the surplus oxidant gas discharge port 19 are formed on the same surface, that is, the intake / exhaust hole surface 30. As a result, the combustor air intake port 17 and the combustion exhaust gas discharge port 18 are formed on the same surface, so that misfire or incomplete combustion of the combustor 13 during strong winds can be suppressed. Further, since the combustion exhaust gas discharge port 18 and the surplus oxidant gas discharge port 19 are formed on the same surface, the combustion exhaust gas and the surplus oxidant gas can be easily mixed. Accordingly, since the oxidant gas flows into the combustion air intake port 17 together with the combustion exhaust gas, incomplete combustion of the combustor 13 due to the inflow of the combustion exhaust gas into the combustion air intake port 17 can be suppressed. By these effects, incomplete combustion and misfire of the combustor 13 of the fuel cell system 100 can be suppressed after all.

  Here, the combustor air intake port 17, the combustion exhaust gas discharge port 18, and the surplus oxidant gas discharge port 19 are precisely located in the vicinity of the front and rear of the intake / exhaust hole surface 30 for reasons of arrangement structure. It is formed on the surface P. However, even in such a case, the above-described effect is exhibited. Further, the above-described effects can be obtained even if these intake / exhaust ports 17, 18, 19 are not located on the same plane P as shown in the figure as long as they are in the vicinity of the intake / exhaust hole surface 30. For example, even if the combustor air inlet 17 is formed near the outside of the intake / exhaust hole surface 30 and the combustion exhaust gas outlet 18 and the surplus oxidant gas outlet 19 are formed near the inside of the intake / exhaust hole surface 30, Is played. That is, even if these intake / exhaust ports 17, 18, 19 are formed at positions near the intake / exhaust hole surface 30 at a position with irregularities in a side view, the above-described effect can be obtained. Therefore, “the combustor air intake port 17, the combustion exhaust gas discharge port 18, and the surplus oxidant gas discharge port 19 are formed on the same surface” means that the vicinity of the same surface is within the range where the above-described effect is achieved. The structure as formed in the above is also included.

  The combustor air intake port 17, the combustion exhaust gas discharge port 18, and the surplus oxidant gas discharge port 19 are preferably formed in the same direction D on the intake / exhaust hole surface 30. As a result, the influence of pressure fluctuations due to strong wind on the intake air at the combustor air intake port 17 and the exhaust gas at the combustion exhaust gas discharge port 18 and the surplus oxidant gas discharge port 19 can be further reduced. Or incomplete combustion can be suppressed more. The intake / exhaust hole surface 30 is not a flat surface but a curved surface, and the directions of the combustor air intake port 17, the combustion exhaust gas discharge port 18, and the surplus oxidant gas discharge port 19 are not exactly the same direction. If the directions are substantially the same, the above-described effects are exhibited. Therefore, "the combustor air intake port 17, the combustion exhaust gas discharge port 18, and the surplus oxidant gas discharge port 19 are formed in the same direction D on the intake / exhaust hole surface 30" is due to the strong wind. A configuration is also included in which they are formed in substantially the same direction within a range in which the influence of pressure fluctuation can be further reduced.

  FIG. 2A is a perspective view schematically showing the appearance of the first embodiment of the fuel cell system of the present invention. As shown in the figure, the housing 11 has a rectangular parallelepiped shape here. The intake / exhaust hole surface 30 on the housing 11 side has a hole directly connected to the combustor air intake port 17, a hole directly connected to the combustion exhaust gas discharge port 18, and a hole directly connected to the surplus oxidant gas discharge port 19. Is formed. In addition, louvers, filters, and the like are appropriately disposed so that dust and the like do not enter the holes.

  Since the intake / exhaust hole surface 30 is a substantially vertical surface and the direction D is a substantially horizontal direction, it is possible to suppress the intrusion of rainwater from above or the entry of dust or the like from below, so that the fuel cell system 100 Incomplete combustion and misfire of the combustor 13 can be more reliably suppressed.

  Further, the combustor air intake port 17 is formed at a position lower than the combustion exhaust gas discharge port 19. As a result, since the combustion exhaust gas is hotter than the atmosphere and diffuses upward, the intake of the combustion exhaust gas from the combustor air inlet 17 can be suppressed, and the combustion of the combustor 13 of the fuel cell system 100 can be suppressed. Incomplete combustion and misfire can be more reliably suppressed.

  Further, the intake / exhaust hole surface 30 is the surface having the largest area among the surfaces of the housing 11, and the combustion exhaust gas discharge port 18, the combustor air intake port 17 and the surplus oxidant gas discharge port 19 are connected to the combustion exhaust gas discharge port 18. And the combustor air intake port 17 are formed to be equal to or greater than the distance between the surplus oxidant gas discharge port 19 and the combustion exhaust gas discharge port 18. As a result, the combustion exhaust gas discharged from the combustion exhaust gas discharge port 18 and the oxidant gas discharged from the surplus oxidant gas discharge port 19 are diffused in the atmosphere, so that they are discharged farther from the combustor air intake port 17. Inhalation of the combustion exhaust gas to be performed can be suppressed, and incomplete combustion and misfire of the combustor 13 of the fuel cell system 100 can be more reliably suppressed.

  Next, a modification of the formation positions of the combustor air inlet 17, the combustion exhaust gas outlet 18, and the surplus oxidant gas outlet 19 on the intake / exhaust hole surface 30 will be described.

[Modification 1]
FIG. 2B is a perspective view schematically showing the external appearance of Modification 1 of the first embodiment of the fuel cell system of the present invention. As shown in the figure, the surplus oxidant gas discharge port 19 is formed in the vicinity of the combustion exhaust gas discharge port 18 in the intake / exhaust hole surface 30, precisely in the vicinity of the intake / exhaust hole surface 30. As a result, diffusion mixing of the combustion exhaust gas and surplus oxidant gas in the atmosphere is promoted, so that intake of combustion exhaust gas from the combustor air inlet 17 can be suppressed, and the combustor 13 of the fuel cell system 100 can be suppressed. Incomplete combustion and misfire can be more reliably suppressed.

[Modification 2]
FIG.2 (c) is a perspective view which shows typically the external appearance of the modification 2 of 1st Embodiment of the fuel cell system of this invention. As shown in the drawing, in the intake / exhaust hole surface 30, precisely, in the vicinity of the intake / exhaust hole surface 30, an excess oxidant gas discharge port 19 is formed between the combustion exhaust gas discharge port 18 and the combustor air intake port 17. Yes. As a result, diffusion mixing with surplus oxidant gas is promoted while the combustion exhaust gas reaches the combustor air intake port 17, so that intake of the combustion exhaust gas from the combustor air intake port 17 can be suppressed. Incomplete combustion and misfire of the combustor 13 of the fuel cell system 100 can be more reliably suppressed.

  The intake / exhaust hole surface 30 and the combustor air intake port 17, the combustion exhaust gas discharge port 18, or the surplus oxidant gas discharge port 19 are not joined as shown in FIG. Thereby, installation and removal of the housing 11 at the time of maintenance inspection can be facilitated. The intake / exhaust hole surface 30 and the combustor air intake port 17, the combustion exhaust gas discharge port 18, or the surplus oxidant gas discharge port 19 are configured to be easily joined and separated by screws or the like via a flange or the like. You can also

  Further, the combustion exhaust gas discharge port 18 may be disposed so as to be joined to the intake / exhaust port surface 30 or slightly protrude outward from the hole of the intake / exhaust port surface 30. Thereby, the possibility that the combustion exhaust gas leaks into the housing 11 can be suppressed. In this case, the combustion exhaust gas discharge port 18 is configured to protrude to the outside of the housing 11 from the combustor air intake port 17 and the surplus oxidant gas discharge port 19. That is, before and after the intake / exhaust hole surface 30, the combustion exhaust gas discharge port 18, the combustor air intake port 17 and the surplus oxidant gas discharge port 19 are formed.

  The housing 11 is formed with outside air circulation holes 25 </ b> A and 25 </ b> B at positions below the combustion exhaust gas outlet 18. Thus, the fuel cell air supply device 16 sucks the air in the housing 11, and the outside air is introduced into the housing 11 from the outside air circulation holes 25 </ b> A and 25 </ b> B. Accordingly, since the combustion exhaust gas diffuses upward, the inflow of the combustion exhaust gas from the outside air circulation holes 25A and 25B into the housing 11 can be suppressed, and the fuel cell air supply device 16 can provide a special fan or blower. Without using the ventilator, the housing 11 is ventilated, and stagnation of combustible gases such as raw materials and fuel gas in the housing 11 is suppressed, thereby simplifying the fuel cell system and improving safety. it can.

(Second Embodiment)
FIG. 3 is a schematic diagram showing the basic configuration of the second embodiment of the fuel cell system of the present invention.

  The fuel cell system 200 of the second embodiment is different in the configuration of the combustor air inlet 17, the combustion exhaust gas outlet 18, and the surplus oxidant gas outlet 19 of the fuel cell system 100 of the first embodiment. Accordingly, since the remaining configuration is the same as that of the fuel cell system 100, description of the configuration and operation of the fuel cell system 200 will be omitted, and only differences will be described. Also, in FIG. 3, the same or corresponding parts as in FIG.

  First, the air intake duct 20 is connected to the combustor air supply device 14, and the combustor air intake port 17 is formed at the upstream end of the air intake duct 20 in the air flow direction. The air suction duct 20 has an ascending slope or an ascending step in the air flow direction. Thereby, in addition to the effect of 1st Embodiment, 2nd Embodiment can suppress the penetration | invasion to the air supply apparatus 14 for combustors by the rain and a snowstorm.

  Further, the combustion exhaust gas duct 21 is connected to the downstream end of the combustion exhaust gas passage 7 in the combustion exhaust gas flow direction, and the combustion exhaust gas discharge port 18 is formed at the downstream end of the combustion exhaust gas duct 21. The combustion exhaust gas duct 21 has a downward slope or a downward step in the flow direction of the combustion exhaust gas. Thereby, in addition to the effect of 1st Embodiment, 2nd Embodiment can suppress the penetration | invasion to the hydrogen production | generation apparatus 12 inside of the water droplet by a rain and a snowstorm.

  Further, the surplus oxidant gas duct 24 is connected to the downstream end of the surplus oxidant gas flow path 5, and the surplus oxidant gas discharge port 19 is provided at the downstream end of the surplus oxidant gas duct 24 in the surplus oxidant gas flow direction. Is formed. The surplus oxidant gas duct 24 has a downward slope or a downward step in the flow direction of the surplus oxidant gas. Thereby, in addition to the effect of 1st Embodiment, 2nd Embodiment can suppress the penetration | invasion to the excess oxidant gas flow path 5 of the water droplet by a rainstorm or a snowstorm.

  Here, the modification of the structure of the air suction duct 20, the combustion exhaust gas discharge duct 21, or the surplus oxidant gas discharge duct 24 is shown.

[Modification 1]
FIG. 4A is a schematic diagram schematically showing a modification of the air suction duct of the second embodiment of the fuel cell system of the present invention. As shown in the figure, a sound absorbing part 41 is formed in the air suction duct 20. As a result, noise generated in the fuel cell system 200 such as driving sound of the combustor air supply device 14 can be prevented, and the quietness of the fuel cell system 200 can be improved. Here, the sound absorbing portion is provided at either one of both end portions of the air suction duct 20 or a part of the duct, and is constituted by a widened portion in which the shape of the duct is widened. Or what is called a general silencer can also be used.

[Modification 2]
FIG. 4B is a schematic view schematically showing a modification of the flue gas duct of the second embodiment of the fuel cell system of the present invention. As shown in the figure, a sound absorbing portion 42 is formed in the combustion exhaust gas duct 21. As a result, noise generated in the fuel cell system 200 such as combustion noise in the combustor 13 can be prevented, and the quietness of the fuel cell system 200 can be improved. Here, the configuration and the configuration position of the sound absorbing unit are the same as in the first modification.

[Modification 3]
FIG.4 (c) is a schematic diagram which shows typically the modification of the surplus oxidant gas duct of 2nd Embodiment of the fuel cell system of this invention. As shown in the drawing, a sound absorbing portion 43 is formed in the surplus oxidant gas duct 24. As a result, noise generated in the fuel cell system 200 such as the distribution temperature of the surplus oxidant gas can be prevented, and the quietness of the fuel cell system 200 can be improved. Here, the configuration and the configuration position of the sound absorbing unit are the same as in the first modification.

  Next, the operation of the fuel cell system 200 configured as described above will be described.

  In the fuel cell system 200, the raw material and water are supplied to the hydrogen generator 12 from the raw material channel 1 and the water channel 2 connected to the hydrogen generator 12, respectively. In the hydrogen generator 12, water or steam is added to the raw material and heated to generate hydrogen-rich fuel gas. The fuel gas is supplied to the fuel cell 15 as the anode gas through the fuel gas flow path 3. Further, air is supplied from the FC air supply device 16 to the fuel cell 15 as an oxidant gas, that is, a cathode gas. Thereby, the fuel cell 15 can generate electric power using the fuel gas and the oxidant gas.

  Excess oxidant gas discharged from the fuel cell 15, here air, passes through the surplus oxidant gas flow path 5 and is discharged into the atmosphere at the surplus oxidant gas discharge port 19. Further, surplus fuel gas discharged from the fuel cell 15 is supplied to the combustor 13 through the surplus fuel gas passage 4. The air drawn from the air inlet 17 of the B air supply device 14 is sent to the combustor 13. Then, combustible gas such as surplus fuel gas is burned in the combustor 13, and the generated heat is supplied to the hydrogen generator 12. Further, the combustion exhaust gas generated in the combustor 13 passes through the combustion exhaust gas passage 7 and is discharged into the atmosphere at the combustion exhaust gas outlet 18.

  Here, since the combustor air intake port 17 and the combustion exhaust gas discharge port 18 are formed on the same surface, misfire or incomplete combustion of the combustor 13 during strong winds can be suppressed. Further, the combustion exhaust gas outlet 18 and the surplus oxidant gas outlet 19 are formed on the same surface. Therefore, since the oxidant gas flows into the combustion air intake port 17 together with the combustion exhaust gas during a strong wind, incomplete combustion of the combustor 13 due to the inflow of the combustion exhaust gas into the combustion air intake port 17 can be suppressed. Due to these effects, incomplete combustion and misfire of the combustor 13 of the fuel cell system 200 can be suppressed.

(Third embodiment)
FIG. 5 is a schematic diagram showing the basic configuration of the third embodiment of the fuel cell system of the present invention. FIG. 6 is a perspective view schematically showing the appearance of the third embodiment of the fuel cell system of the present invention.

  The fuel cell system 300 of the third embodiment is different in the configuration of the combustion exhaust gas outlet 18 and the surplus oxidant gas outlet 19 of the fuel cell system 100 of the first embodiment. Accordingly, since the remaining configuration is the same as that of the fuel cell system 100, description of the configuration and operation of the fuel cell system 300 will be omitted, and only the differences will be described. 5 and FIG. 6, the same reference numerals are given to the same or corresponding parts as those in FIG. 1 and FIG.

  As shown in FIG. 5, the fuel cell system 300 includes a combustor air intake port 17 and an integrated exhaust port 31 that collectively discharges the combustion exhaust gas and the surplus oxidant gas into the atmosphere. Exactly, it is formed on the same surface P in the vicinity of the intake / exhaust hole surface 30 as in FIG. Specifically, the surplus oxidant gas flow path 5 merges with the combustion exhaust gas flow path 7, and an integrated discharge port 31 is formed at the downstream end of the surplus oxidant gas and combustion exhaust gas in the flow direction.

  As shown in FIG. 6, the intake / exhaust hole surface 30 which is the side surface of the housing 11 is formed with a hole directly connected to the combustor air intake port 17 and a hole directly connected to the integrated exhaust port 31. In addition, louvers, filters, and the like are appropriately disposed so that dust and the like do not enter the holes.

  With such a configuration, the combustion exhaust gas is mixed with the surplus oxidant gas at the integrated exhaust port 31 and discharged, so that the intake of the combustion exhaust gas from the combustor air intake port 17 can be further suppressed, and the fuel cell system Incomplete combustion and misfire of the combustor 13 can be more reliably suppressed. Further, since the combustion exhaust gas and the surplus oxidant gas are merged, the exhaust pressure of the integrated discharge port 31 is increased, and the resistance to the wind pressure at the integrated discharge port can be improved. Therefore, misfire or incomplete combustion of the combustor 13 during a strong wind can be more reliably suppressed.

  Here, the combustor air intake port 17 and the integrated exhaust port 31 are precisely formed on the surface P which is a position near the front and rear of the intake / exhaust hole surface 30 for the reason of the arrangement structure. However, even in such a case, the above-described effect is exhibited. Further, the intake and exhaust ports 17 and 31 may be misfired or incompletely combusted in a strong wind of the combustor 13 even if they are not located on the same plane P as shown in the figure as long as they are in the vicinity of the intake and exhaust hole surface 30. Incomplete combustion of the combustor 13 due to inflow of combustion exhaust gas into the combustion air inlet 17 can be suppressed. For example, even if the combustor air intake port 17 is formed in the vicinity of the outside of the intake / exhaust hole surface 30 and the integrated exhaust port 31 is formed in the vicinity of the inside of the intake / exhaust hole surface 30, the above effect can be obtained. That is, even if these intake / exhaust ports 17 and 31 are formed in positions near the intake / exhaust hole surface 30 in a concavo-convex view in a side view, the above-described effect is exhibited. Therefore, “the combustor air intake port 17 and the integrated exhaust port 31 are formed on the same surface” includes a configuration in which the combustor air intake port 17 and the integrated discharge port 31 are formed in the vicinity of the same surface within the range where the above-described effect is achieved.

  Further, it is preferable that the combustor air intake port 17 and the integrated exhaust port 31 are further formed in the same direction D on the intake / exhaust hole surface 30. As a result, the influence of pressure fluctuations caused by strong wind on the intake air at the combustor air intake port 17 and the exhaust gas at the integrated exhaust port 31 can be further reduced, so that misfire or incomplete combustion of the combustor 13 can be suppressed. it can.

  If the intake / exhaust hole surface 30 is not a flat surface but a curved surface, and the directions of the combustor air intake port 17 and the integrated exhaust port 31 are not exactly the same direction, but the directions are substantially the same, the above effect is obtained. Play. Therefore, “the combustor air intake port 17 and the integrated exhaust port 31 are formed in the same direction D on the intake / exhaust hole surface 30” can further reduce the influence of pressure fluctuations caused by strong winds. The structure which is formed in the substantially same direction in the possible range is also included.

(Fourth embodiment)
FIG. 7 is a schematic diagram showing the basic configuration of the fourth embodiment of the fuel cell system of the present invention.

  The fuel cell system 400 according to the fourth embodiment is different from the fuel cell system 300 according to the third embodiment in that an oxidant gas suction duct 26 is provided. Accordingly, since the remaining configuration is the same as that of the fuel cell system 100 or the fuel cell system 300, description of the configuration and operation of the fuel cell system 400 will be omitted, and only the differences will be described. In FIG. 7, the same or corresponding parts as those in FIG. 1 or FIG.

  As shown in FIG. 7, in the fuel cell system 400, the oxidant gas suction duct 26 is connected to the FC air supply device 16, and the oxidant gas suction is taken into the upstream end of the oxidant gas suction duct 26 in the oxidant gas flow direction. A mouth 27 is formed. Here, in the fuel cell system 400, the oxidant gas inlet 27, the combustor air inlet 17, and the integrated outlet 31 are formed in the intake / exhaust hole surface 30, more precisely, as in FIG. 1. Since it is formed on the same surface P in the vicinity, fluctuations in the oxidant gas flow rate during strong winds can be suppressed. That is, in the fuel cell system 400 of the fourth embodiment, in addition to the effects of the fuel cell system 100 of the first embodiment and the fuel cell system 300 of the third embodiment, the stability of the fuel cell system 400 during operation is improved. Can be improved.

  Here, the combustor air intake port 17 and the integrated exhaust port 31 are precisely formed on the surface P which is a position near the front and rear of the intake / exhaust hole surface 30 for the reason of the arrangement structure. However, even in such a case, improvement in stability during operation of the fuel cell system 400, misfire or incomplete combustion in a strong wind of the combustor 13, and combustion due to inflow of combustion exhaust gas into the combustion air intake port 17 Incomplete combustion of the vessel 13 can be suppressed. In addition, if the intake and exhaust ports 17, 27, and 31 are located in the vicinity of the intake / exhaust hole surface 30, the above-described effects can be obtained even if they are not located on the same plane P as shown in the figure. For example, even if the oxidant gas inlet 27 and the combustor air inlet 17 are formed near the outside of the intake / exhaust hole surface 30 and the integrated exhaust port 31 is formed near the inside of the intake / exhaust hole surface 30, the above effect can be obtained. Is done. That is, even if these intake / exhaust ports 17, 27, 31 are formed at positions near the intake / exhaust hole surface 30 at a position with irregularities in a side view, the above-described effect can be obtained. Therefore, “the oxidant gas inlet 27, the combustor air inlet 17, and the integrated outlet 31 are formed on the same surface” is formed in the vicinity of the same surface within a range where the above-described effect is exhibited. The structure which is made is also included.

  The oxidant gas inlet 27, the combustor air inlet 17, and the integrated outlet 31 are preferably formed further in the same direction D on the intake / exhaust hole surface 30. As a result, the influence of pressure fluctuations caused by strong wind on the intake air at the combustor air intake port 17 and the exhaust gas at the integrated exhaust port 31 can be further reduced, so that misfire or incomplete combustion of the combustor 13 can be suppressed. it can.

  The intake / exhaust hole surface 30 is not a flat surface but a curved surface, and the directions of the oxidant gas intake port 27, the combustor air intake port 17 and the integrated exhaust port 31 are not exactly the same direction but are almost the same direction. If so, the above-described effects are exhibited. Therefore, “the oxidant gas inlet 27, the combustor air inlet 17 and the integrated outlet 31 are formed in the same direction D on the intake / exhaust hole surface 30” means that the pressure fluctuates due to strong wind. A configuration is also included in which they are formed in substantially the same direction within a range in which the influence of the above can be further reduced.

  Further, as shown in the drawing, the intake / exhaust hole surface 30 of the housing 11 is directly connected to the hole directly connected to the combustor air intake port 17, the hole directly connected to the integrated exhaust port 31, and the oxidant gas intake port 27. A hole is formed. Although not shown, louvers, filters, and the like are appropriately arranged in the same manner as in FIGS. 2A to 2C and FIG. 6 so that dust or the like does not enter these holes.

(Fifth embodiment)
FIG. 8 is a schematic diagram showing a basic configuration of the fifth embodiment of the fuel cell system of the present invention.

  The fuel cell system 500 according to the fifth embodiment is different from the fuel cell system 300 according to the third embodiment in that an oxidant gas suction duct 26 is provided. Accordingly, since the remaining configuration is the same as that of the fuel cell system 100 or the fuel cell system 300, description of the configuration and operation of the fuel cell system 500 will be omitted, and only the differences will be described. Further, in FIG. 8, the same or corresponding parts as those in FIG. 1 or FIG.

  As shown in FIG. 8, in the fuel cell system 500, the oxidant gas suction duct 26 is connected to the FC air supply device 16, and the oxidant gas suction is taken into the upstream end of the oxidant gas suction duct 26 in the oxidant gas flow direction. A mouth 27 is formed. Here, the oxidant gas inlet 27 is formed on a surface 32 different from the intake / exhaust hole surface 30 in a direction different from the direction D. As a result, intake of combustion exhaust gas from the oxidant gas inlet 27 can be suppressed. That is, in the fuel cell system 400 of the fourth embodiment, in addition to the effects of the fuel cell system 100 of the first embodiment and the fuel cell system 300 of the third embodiment, the stability of the fuel cell system 400 during operation is improved. Can be improved.

  As shown in the figure, the surface 32 of the housing 11 has a hole directly connected to the oxidant gas inlet 27. Although not shown, louvers, filters, and the like are appropriately disposed so that dust and the like do not enter the holes.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to the said embodiment. From the foregoing description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the foregoing description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. As long as the effects of the present invention can be obtained, the details of the structure and / or function can be changed. For example, the various ducts of the second embodiment are applied to the third embodiment, the fourth embodiment, or the fifth embodiment, or the oxidizing gas suction duct 26 of the fourth embodiment or the fifth embodiment is applied to the first embodiment. Or it can apply suitably to 2nd Embodiment.

  The fuel cell system of the present invention is useful as a fuel cell system that can suppress incomplete combustion and misfire of a combustor of the fuel cell system.

FIG. 1 is a schematic diagram showing the basic configuration of the first embodiment of the fuel cell system of the present invention. FIG. 2 (a) is a perspective view schematically showing the appearance of the first embodiment of the fuel cell system of the present invention, and FIG. 2 (b) is a modification of the first embodiment of the fuel cell system of the present invention. FIG. 2C is a perspective view schematically showing the appearance of Modification 2 of the first embodiment of the fuel cell system of the present invention. FIG. 3 is a schematic diagram showing the basic configuration of the second embodiment of the fuel cell system of the present invention. FIG. 4 (a) is a schematic view schematically showing a modification of the air suction duct of the second embodiment of the fuel cell system of the present invention, and FIG. 4 (b) is a diagram of the fuel cell system of the present invention. FIG. 4C is a schematic diagram schematically showing a modification of the flue gas duct of the second embodiment, and FIG. 4C schematically shows a modification of the surplus oxidant gas duct of the second embodiment of the fuel cell system of the present invention. It is a schematic diagram shown. FIG. 5 is a schematic diagram showing the basic configuration of the third embodiment of the fuel cell system of the present invention. FIG. 6 is a perspective view schematically showing the appearance of the third embodiment of the fuel cell system of the present invention. FIG. 7 is a schematic diagram showing the basic configuration of the fourth embodiment of the fuel cell system of the present invention. FIG. 8 is a schematic diagram showing a basic configuration of the fifth embodiment of the fuel cell system of the present invention.

DESCRIPTION OF SYMBOLS 1 Raw material flow path 2 Water flow path 3 Fuel gas flow path 4 Excess fuel gas flow path 5 Excess oxidant gas flow path 6 Oxidant gas flow path 7 Combustion exhaust gas flow path 11 Housing 12 Hydrogen generator 13 Combustor 14 Combustor air supply Device (B air supply device)
DESCRIPTION OF SYMBOLS 15 Fuel cell 15a Anode flow path 15b Cathode flow path 16 Fuel cell air supply apparatus (FC air supply apparatus)
17 Combustor air inlet 18 Combustion exhaust gas outlet 19 Excess oxidant gas exhaust port 20 Air intake duct 21 Combustion exhaust gas duct 24 Excess oxidant gas duct 25A, 25B Outside air vent 26 Oxidant gas inlet duct 27 Oxidant gas inlet 30 Intake / exhaust hole surface 31 Integrated exhaust port 32 surface 41, 42, 43 Sound absorbing part 100, 200, 300, 400, 500, 600 Fuel cell system D direction P surface

Claims (16)

A hydrogen generator that reforms the raw material into a hydrogen-rich fuel gas by heating; and
A combustor for burning the combustible gas using air to heat the hydrogen generator;
A combustor air supply device for supplying the air to the combustor;
A fuel cell that generates power using the fuel gas and the oxidant gas;
An oxidant gas supply device for supplying the oxidant gas to the fuel cell;
A fuel cell system comprising the hydrogen generator, the combustor, the combustor air supply device, the polyhedron housing that houses the fuel cell and the oxidant gas supply device,
Combustor air intake port of the combustor air supply device for sucking the air, combustion exhaust gas discharge port for discharging the combustion exhaust gas of the combustor to the atmosphere, and surplus oxidant for discharging excess oxidant gas to the atmosphere A fuel cell system, wherein a gas discharge port is formed on the same surface of the housing.   2. The fuel cell system according to claim 1, wherein the combustor air intake port and an integrated exhaust port for collectively discharging the combustion exhaust gas and the surplus oxidant gas to the atmosphere are formed on the same surface.   The fuel cell system according to claim 1, wherein the combustor air inlet, the combustion exhaust gas outlet, and the surplus oxidant gas outlet are formed in the same direction.   The fuel cell system according to claim 2, wherein the combustor air inlet and the integrated outlet are formed in the same direction.   The fuel cell system according to claim 3, wherein the same surface is a substantially vertical surface, and the same direction is a substantially horizontal direction.   The fuel cell system according to claim 5, wherein the combustor air inlet is formed at a position below the combustion exhaust gas outlet. An air intake duct connected to the combustor air supply device;
2. The fuel cell system according to claim 1, wherein the combustor air intake port is formed at an upstream end portion of the air intake duct in the air flow direction, and the air intake duct has an upward slope or an upward step in the air flow direction. . Having a flue gas duct through which the flue gas flows;
2. The fuel cell according to claim 1, wherein the combustion exhaust gas discharge port is formed at a downstream end of the combustion exhaust gas duct in the combustion exhaust gas distribution direction, and the combustion exhaust gas duct has a downward slope or a downward step in the combustion exhaust gas distribution direction. system. A surplus oxidant gas duct through which the surplus oxidant gas flows;
The surplus oxidant gas discharge port is formed at the downstream end of the surplus oxidant gas duct in the surplus oxidant gas flow direction, and the surplus oxidant gas duct has a downward slope or a step in the flow direction of the surplus oxidant gas. The fuel cell system according to claim 1. An air intake duct connected to the combustor air supply device;
2. The fuel cell system according to claim 1, wherein the combustor air intake port is formed at an upstream end portion of the air intake duct in the air flow direction, and a sound absorbing portion is formed in the air intake duct. Having a flue gas duct through which the flue gas flows;
2. The fuel cell system according to claim 1, wherein the combustion exhaust gas discharge port is formed at a downstream end portion of the combustion exhaust gas duct in the combustion exhaust gas flow direction, and the sound absorption part is formed in the combustion exhaust gas duct. A surplus oxidant gas duct through which the surplus oxidant gas flows;
2. The fuel according to claim 1, wherein the surplus oxidant gas discharge port is formed at a downstream side end portion of the surplus oxidant gas duct in the surplus oxidant gas flow direction, and a sound absorbing part is formed in the surplus oxidant gas duct. Battery system. The oxidant gas supply device is a fuel cell air supply device for supplying air to a fuel cell,
The fuel cell system according to claim 1, wherein an air inlet for the fuel cell of the air supply device for the fuel cell is formed on the same surface. The oxidant gas supply device is a fuel cell air supply device for supplying air to a fuel cell,
2. The fuel cell system according to claim 1, wherein the fuel cell air intake port of the fuel cell air supply device is formed on a surface different from the same surface. The oxidant gas supply device is a fuel cell air supply device for supplying air to a fuel cell,
An air inlet for the fuel cell of the air supply device for the fuel cell is formed in the housing;
The fuel cell system according to claim 1, wherein at least one outside air circulation hole is formed in the housing at a position below the combustion exhaust gas discharge port. The same surface is a surface having the largest area among the surfaces of the housing,
The combustion exhaust gas exhaust port, the combustor air intake port, and the surplus oxidant gas exhaust port are arranged such that the distance between the combustion exhaust gas exhaust port and the combustor air intake port is the surplus oxidant gas exhaust port and the combustion exhaust gas. The fuel cell system according to claim 1, wherein the fuel cell system is formed so as to be at least a distance from the discharge port.

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