JP2008084646A - Fuel cell system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell system with energy efficiency of the system as a whole improved by reducing energy needed for humidification of gas supplied to a fuel cell, and with miniaturization of the system, stabilization of system operation, and cost reduction aimed at. <P>SOLUTION: A fuel gas humidifier 25 warms up moisture contained in exhaust fuel gas exhausted from the fuel cell 19 with cooling water cooling heat of the fuel cell at power generation, and makes humidification of supply fuel gas through a moisture transfer film 25c. The fuel gas humidifier 25 is provided with an outer wall 25a, and a partitioning plate 25b as well as the moisture transfer film 25c inside the outer wall 25a, and is structured by being divided into a fuel gas cooling water room, an exhaust fuel gas room, and a supply fuel gas room. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel cell system that generates power and supplies heat using a fuel cell.

  A fuel cell system is known to generate electric power and heat in a fuel cell by reacting a hydrogen-rich gas supplied as a fuel gas with air supplied as an oxidant gas.

  The fuel gas and the oxidant gas are supplied to the fuel cell after being humidified by the humidifying means. As a means for humidifying the fuel gas and the oxidant gas, for example, there is a bubbler that performs humidification through the fuel gas and the oxidant gas in warm water heated by a heater (see, for example, Patent Document 1).

On the other hand, moisture (water vapor) contained in the exhaust air (off gas) discharged from the air electrode side of the fuel cell is moved to the air supplied to the air electrode side of the fuel cell through the water vapor permeable membrane, and supplied thereby A humidifier that humidifies air is known (for example, see Patent Document 2). This humidifier is intended to reduce energy required for humidification by performing humidification using high-temperature exhaust air.
JP 7-288134 A JP-A-6-132038

  However, the humidifying means described in Patent Document 1 consumes energy to heat water in the bubbler, and thus causes a reduction in energy efficiency of the fuel cell system.

  Further, the humidifier described in Patent Document 2 can humidify a humidified gas (here, supply air to be humidified) to a dew point temperature equal to or higher than the humidification gas (exhaust air from which moisture is supplied here). In addition, in order to humidify the humidified gas to a high dew point temperature, a water vapor permeable membrane having a large membrane area is required, and the scale of the humidifying device is increased. Therefore, it is difficult to make the fuel cell system compact with this humidifier.

  The present invention solves the above-described problems of the conventional fuel cell system. By reducing the energy required for humidifying the gas supplied to the fuel cell, the energy efficiency of the entire system is improved and the system is made compact. An object of the present invention is to provide a fuel cell system that can stabilize system operation, reduce costs, and improve quality during manufacture.

  In order to solve the above-described problems, a fuel cell system according to the present invention includes a fuel cell that generates power using a fuel gas and an oxidant gas, and a fuel gas humidifier that humidifies a supply fuel gas supplied to the fuel cell. And the fuel gas humidifier warms the moisture contained in the exhaust fuel gas or the exhaust oxidant gas discharged from the fuel cell with cooling water that has cooled the heat at the time of power generation of the fuel cell. The supply fuel gas is humidified through a moving membrane, and the fuel gas humidifier is formed in a cylindrical shape, and is partitioned into a hollow shape by a moisture moving membrane disposed inside the outer wall, Furthermore, it is partitioned into a hollow shape by a partition plate arranged inside the moisture transfer membrane, the supply fuel gas is supplied between the outer wall and the moisture transfer membrane, and the partition plate and the moisture transfer membrane are Exhaust fuel Gas supply, a fuel cell system for supplying the fuel cooling water to the inside of the partition plate.

  A fuel cell that generates power using the fuel gas and the oxidant gas; and an oxidant gas humidifier that humidifies the supply oxidant gas supplied to the fuel cell. Moisture contained in the exhaust fuel gas or exhaust oxidant gas discharged from the fuel cell is heated with cooling water that has cooled the heat during power generation of the fuel cell, and the supplied oxidant gas is humidified through the moisture transfer membrane. The oxidant gas humidifier is formed in a cylindrical shape, and is partitioned into a hollow shape by a water movement film disposed inside the outer wall, and further disposed inside the water movement film. The partition plate is partitioned into a hollow shape, the supply oxidant gas is supplied between the outer wall and the moisture transfer membrane, the exhaust oxidant gas is supplied between the partition plate and the moisture transfer membrane, and the partition The oxidation inside the plate Cooling water to the fuel cell system supplies.

  A fuel cell that generates power using fuel gas and oxidant gas; and a fuel gas humidifier that humidifies the supply fuel gas supplied to the fuel cell, wherein the fuel gas humidifier is connected to the fuel cell. The moisture contained in the discharged exhaust gas is heated with cooling water that has cooled the heat generated during the power generation of the fuel cell, and the supplied fuel gas is humidified through a moisture transfer film. The humidifier is formed in a cylindrical shape, is partitioned into a hollow shape by a partition plate disposed inside the outer wall, and is further partitioned into a hollow shape by a moisture transfer membrane disposed inside the partition plate, and the outer wall The fuel cooling water is supplied between the partition plate and the partition plate, the exhaust fuel gas is supplied between the partition plate and the moisture transfer membrane, and the supplied fuel gas is supplied inside the moisture transfer membrane. .

  A fuel cell that generates power using the fuel gas and the oxidant gas; and an oxidant gas humidifier that humidifies the supply oxidant gas supplied to the fuel cell. The moisture contained in the exhaust oxidant gas discharged from the fuel cell is heated with cooling water that has cooled the heat generated during the power generation of the fuel cell, and the supplied oxidant gas is humidified through the moisture transfer membrane. The oxidant gas humidifier is formed in a cylindrical shape, and is partitioned into a hollow shape by a partition plate disposed inside the outer wall, and is further formed into a hollow shape by a moisture transfer film disposed inside the partition plate. The oxidant cooling water is supplied between the outer wall and the partition plate, the exhaust oxidant gas is supplied between the partition plate and the moisture transfer film, and the supply oxidant is provided inside the moisture transfer film. Fuel electricity to supply gas The system.

  Accordingly, the fuel gas humidifier or the oxidant gas humidifier has an arrangement configuration in which the outer surfaces of the fuel gas or the supply oxidant gas, the exhaust fuel gas or the exhaust oxidant gas, and the cooling water are in contact with or in close proximity to each other. As a result, it is possible to eliminate or suppress the heat radiation from the respective contact surfaces or extremely close surfaces to the atmosphere, and to provide a highly efficient system.

  Further, according to the present invention, the fuel gas humidifier or the oxidant gas humidifier is provided with the supply fuel gas chamber or the supply oxidant gas chamber between the outer wall and the moisture transfer film, The exhaust fuel gas chamber or the exhaust oxidant gas chamber is provided between the partition plates and piped, and the cooling water is arranged at the center of the fuel gas humidifier or the oxidant gas humidifier to insulate from the outer surface. The temperature drop in the cooling water is suppressed, and heat exchange and humidity exchange (hereinafter collectively referred to as wet heat exchange) of the fuel gas or the oxidant gas can be performed more efficiently.

  Furthermore, the present invention increases the membrane area by using the humidified membrane as a plurality of hollow fiber membranes, improving the efficiency of heat and humidity exchange, and the dew point at the outlet of the fuel gas humidifier or the oxidant gas humidifier is It should be maintained at a high dew point.

  According to the fuel cell system of the present invention, it is possible to improve the energy efficiency and to realize a stable operation of the fuel cell system with excellent durability. In addition, the fuel cell system can be made compact and simplified, and the cost can be reduced, the number of man-hours during manufacturing, and the quality can be improved.

  A first invention includes a fuel cell that generates power using a fuel gas and an oxidant gas, and a fuel gas humidifier that humidifies a supply fuel gas supplied to the fuel cell, wherein the fuel gas humidifier includes: Moisture contained in the exhaust fuel gas or exhaust oxidant gas discharged from the fuel cell is heated with cooling water that has cooled heat during power generation of the fuel cell, and the supplied fuel gas is humidified through a moisture transfer film. The fuel gas humidifier is formed in a cylindrical shape, is partitioned into a hollow shape by a moisture transfer membrane disposed inside the outer wall, and is further disposed inside the moisture transfer membrane. The partition plate is divided into a hollow shape, the supply fuel gas is supplied between the outer wall and the moisture transfer membrane, the exhaust fuel gas is supplied between the partition plate and the moisture transfer membrane, and the partition plate Inside the fuel cooling Water and fuel cell system supplies.

  A second invention includes a fuel cell that generates power using a fuel gas and an oxidant gas, and an oxidant gas humidifier that humidifies a supply oxidant gas supplied to the fuel cell. The heater warms the moisture contained in the exhausted fuel gas or exhausted oxidant gas discharged from the fuel cell with cooling water that has cooled the heat generated during power generation of the fuel cell, and supplies the oxidant through the moisture transfer membrane. A humidifier for gas, wherein the oxidant gas humidifier is formed in a cylindrical shape, and is partitioned into a hollow shape by a moisture transfer film disposed on the inner side of the outer wall, and further inside the moisture transfer film Is partitioned into a hollow shape by a partition plate arranged on the surface, and the supply oxidant gas is supplied between the outer wall and the moisture transfer membrane, and the exhaust oxidant gas is supplied between the partition plate and the moisture transfer membrane. And inside the partition plate The serial oxidant coolant to the fuel cell system supplies.

  According to the first invention or the second invention, the fuel gas humidifier or the oxidant gas humidifier is in contact (close contact) or in close proximity to the extent that heat transfer can be performed between the outer surfaces of each other. Therefore, the space occupied by the humidifying element can be reduced. As a result, the fuel cell system can be made compact, and heat dissipation from the contact surface or the close proximity surface to the atmosphere can be eliminated or suppressed. Can be provided.

  Furthermore, since it is a unitized configuration as a humidifying element, it is possible to reduce costs, reduce man-hours, and improve quality when manufacturing a fuel cell system.

  In addition, the cooling water is disposed at the center of the fuel gas humidifier or the oxidant gas humidifier to insulate from the outer surface, suppress the temperature drop in the cooling water, and the fuel gas or the oxidant gas A system in which heat exchange and humidity exchange (hereinafter collectively referred to as wet heat exchange) are more efficient can be provided.

  A third invention includes a fuel cell that generates power using a fuel gas and an oxidant gas, and a fuel gas humidifier that humidifies a supply fuel gas supplied to the fuel cell, wherein the fuel gas humidifier includes: The moisture contained in the discharged fuel gas discharged from the fuel cell is heated with cooling water that has cooled the heat generated during power generation of the fuel cell, and the supplied fuel gas is humidified through a moisture transfer film. The fuel gas humidifier is formed in a cylindrical shape, and is partitioned into a hollow shape by a partition plate disposed inside the outer wall, and further partitioned into a hollow shape by a moisture transfer membrane disposed inside the partition plate. The fuel cooling water is supplied between the outer wall and the partition plate, the exhaust fuel gas is supplied between the partition plate and the moisture transfer membrane, and the supplied fuel gas is supplied inside the moisture transfer membrane. Battery system To.

  A fourth invention includes a fuel cell that generates power using fuel gas and an oxidant gas, and an oxidant gas humidifier that humidifies a supply oxidant gas supplied to the fuel cell. The heater warms the moisture contained in the exhaust oxidant gas discharged from the fuel cell with cooling water that has cooled the heat during power generation of the fuel cell, and humidifies the supplied oxidant gas through the moisture transfer membrane. The oxidant gas humidifier is formed in a cylindrical shape, and is partitioned into a hollow shape by a partition plate disposed inside the outer wall, and further, moisture transfer disposed inside the partition plate It is divided into a hollow shape by a membrane, the oxidant cooling water is supplied between the outer wall and the partition plate, the exhaust oxidant gas is supplied between the partition plate and the moisture transfer membrane, and inside the moisture transfer membrane Supply the supply oxidant gas A fuel cell system.

  By making it the 3rd invention or the 4th invention, the area of the partition plate which transfers the temperature of the fuel cooling water or the oxidant cooling water is ensured to be equal to or larger than the area of the moisture transfer membrane, and the temperature of the condensed water chamber Can sufficiently raise the temperature of the exhaust gas, so that sufficient exchange of wet heat from the exhaust fuel gas or exhaust oxidant gas to the supply fuel gas or supply oxidant gas can be performed, and high dew point fuel gas or oxidant gas can be supplied to the fuel cell. Since it can be supplied, a high-performance and highly durable fuel cell system can be provided.

  In addition to the invention as described in any one of 1st to 4th, the 5th invention makes the said water | moisture-transfer film | membrane a some hollow fiber membrane.

  With this configuration, the fuel gas humidifier or the oxidizing gas humidifier increases the moisture transfer membrane area, improves the efficiency of temperature / humidity exchange, and the outlet of the fuel gas humidifier or the oxidizing gas humidifier The dew point at can be maintained at a high dew point.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the following embodiments.

(Embodiment 1)
FIG. 1 is a schematic diagram showing a configuration of a fuel cell cogeneration system (hereinafter simply referred to as a fuel cell system) according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the fuel cell system according to Embodiment 1 includes an air supply device 20, an oxidant gas humidifier 21, a fuel cell 19, a fuel supply device 23, a fuel processing device 24, a fuel Gas humidifier 25, cooling water radiator 26, cooling water tank 27, cooling water pump 28, first cooling water path 39, second cooling water path 40, and third cooling water path 41 The fourth cooling water path 42, the hot water storage tank 29, and the hot water storage water circulation path 44 are configured as main elements.

  In particular, details of the fuel gas humidifier 25 or the oxidant gas humidifier 21 will be described later.

  Next, the operation of the entire system will be described. The air supplied from the air supply device 20 to the oxidant gas humidifier 21 via the first air path 30 is humidified by the oxidant gas humidifier 21. The air humidified by the oxidant gas humidifier 21 is supplied as an oxidant gas to the air electrode side of the fuel cell 19 via the second air path 31.

  On the other hand, the raw material is supplied from the fuel supply device 23 to the fuel processing device 24 via the first fuel gas path 33. The raw material is preferably a gas containing at least a compound composed of carbon and hydrogen (for example, city gas, propane, methane, natural gas, etc.), alcohol, or the like.

  Here, the fuel processing device 24 specifically includes a reforming unit that generates a reformed gas containing hydrogen by a reforming reaction, and a shift unit that reduces carbon monoxide in the reformed gas by a shift reaction. A purifying section (none of which is shown) is provided for further reducing carbon monoxide in the reformed gas that has passed through the shift section by a selective oxidation reaction.

  And in the fuel processing apparatus 24, hydrogen-rich gas is produced | generated by heating the supplied raw material in the atmosphere containing water vapor | steam. The hydrogen-rich gas is supplied to the fuel gas humidifier 25 via the second fuel gas path 34 and is humidified.

  The humidified hydrogen-rich gas is supplied to the fuel electrode side of the fuel cell 19 through the third fuel gas path 35 as the fuel gas of the fuel cell 19. In the fuel cell 19, electricity is generated by the reaction between the air supplied to the air electrode side and the hydrogen-rich gas (hereinafter referred to as fuel gas) supplied to the fuel electrode side, and electricity and heat are generated. appear.

  The fuel gas that has not been used for the reaction in the fuel cell 19 becomes discharged fuel gas, is supplied to the fuel gas humidifier 25 through the fourth fuel gas path 38a, and is supplied to the fuel processing device 24 through the fifth fuel gas discharge path 38b. To be supplied.

  The humidification of the hydrogen-rich gas generated by the fuel processing device 24 is performed using the moisture of the exhaust fuel gas flowing into the fuel gas humidifier 25 via the fourth fuel gas path 38a. Strictly speaking, the heat of the exhausted fuel gas is also used, and heat is absorbed from the first cooling water passage 39 to heat the fuel gas, so that a wet heat exchange action is performed in the fuel gas humidifier 25. It has been broken.

  Further, the cooling water whose heat has been recovered by the fuel cell 19 flows into the fuel gas humidifier 25 via the first cooling water passage 39, and then the second cooling water passage 40, and then the oxidant gas humidifier 21. Is supplied to the cooling water radiator 26 and is collected here.

  Further, the cooling water that has passed through the cooling water radiator 26 flows to the cooling water tank 27 via the third cooling water path 41. Then, the cooling water in the cooling water tank 27 is pressurized by the cooling water pump 28 in order to remove the heat generated in the fuel cell 19, and is supplied to the fuel cell 19 again via the fourth cooling water path 42. Repeat the cycle.

  Here, the cooling water in the cooling water tank 27 is maintained at about 70 ° C., and this temperature is a temperature at which sufficient heat exchange with the fuel cell 19 is possible.

  Further, the cooling water will be described in detail. The cooling water whose temperature is about 75 ° C. by recovering the heat of the fuel cell 19 is the first cooling water channel 39, the second cooling water channel 40, the third cooling water. The water is returned again to the cooling water tank 27 through the cooling water channel 41.

  Here, a cooling water radiator 26 is provided between the second cooling water channel 40 and the third cooling water channel 41, and the heat of the cooling water is stored in the hot water circulation path by the cooling water radiator 26. To 44 water. The water in the hot water storage circulation path 44 circulates through the hot water storage tank 29 and the cooling water radiator 26 supplied and stored by a hot water storage pump 43 from a water supply path (not shown). By such heat radiation, the cooling water is cooled again to about 70 ° C.

  In the fuel cell system according to the first embodiment, the cooling water is circulated as described above, and the temperature of the cooling water is stably maintained at a predetermined temperature. Can be maintained at a predetermined temperature.

  Further, in the first embodiment, the fuel gas humidifier 25 is configured by integrating cooling water, exhaust fuel gas, and supply fuel gas. The oxidant gas humidifier 21 is configured by integrating the coolant, the discharged oxidant gas, and the supply oxidant gas.

  Next, the fuel gas humidifier 25 that is a feature of the first embodiment will be described. 2, 4, and 6 are explanatory diagrams for explaining the configuration and heat exchange / humidity exchange (hereinafter collectively referred to as wet heat exchange) operation of the humidifier 25 in the fuel cell system shown in FIG. 1. . 2, 4, and 6, the fuel gas humidifier 25 and the oxidant gas humidifier 21 have the same configuration, and the fuel gas humidifier 25 will be described here.

  That is, the fuel gas humidifier 25 has an external cylindrical configuration, the inside is provided with a fuel cooling water chamber 45 in the center, a partition plate 25b is provided on the outer periphery of the fuel cooling water chamber 45, and the outer periphery of the partition plate 25b is provided. The condensate water chamber 46 is formed between the moisture transfer film 25c provided on the outer wall 25c, and the supply fuel gas chamber 47 is formed between the outer wall 25a and the moisture transfer film 25c. Further, the moisture transfer film 25c is made of a material capable of transferring moisture (water vapor) from the high moisture concentration side to the low moisture concentration side, and additionally allowing heat transfer from the high temperature side to the low temperature side. Here, for example, a proton conductive polymer electrolyte membrane represented by a Nafion-based membrane or the like is used for the moisture transfer membrane 25c.

  More specifically, the fuel gas humidifier 25 is divided into a supply fuel gas chamber 47 and a condensate water chamber 46 by a moisture transfer film 25 c so that the longitudinal sectional shape is divided into a hollow shape (for example, a donut shape). Is divided into a condensate water chamber 46 and a fuel gas cooling water chamber 45 in a hollow shape by a partition plate 25b made of a material having good heat transfer. The fuel gas chamber 47, the condensate water chamber 46, the fuel gas In order to keep the cooling water chamber 45 hollow, the outer wall 25a, the moisture transfer film 25c, and the partition plate 25b are fixed and brought into close contact by fixing members 25e and 25d (potting or the like).

  The vertical cross-sectional shape of the humidifier is a donut-shaped hollow shape. However, in order to further reduce the size of the fuel gas humidifier 25, it may be rectangular or polygonal.

  Supply fuel gas, exhaust fuel gas, and cooling water flow through the fuel gas chamber 47, the condensed water chamber 46, and the fuel cooling water chamber 45 of the fuel gas humidifier 25 configured as described above as follows.

  The supply fuel gas flows into the supply fuel gas chamber 47 of the fuel gas humidifier 25 from the supply fuel gas inlet 47a provided in the fixed member 25d, and flows out from the supply fuel gas outlet 47b. The exhaust fuel gas flows into the condensate water chamber 46 of the fuel gas humidifier 25 from the exhaust fuel gas inlet 46a provided in the fixed member 25e, and flows out from the exhaust fuel gas outlet 46b. The cooling water flows into the fuel cooling water chamber 45 of the fuel gas humidifier 25 from the fuel cooling water inlet 45a provided in the fixed member 25d, and flows out from the fuel gas cooling water outlet 45b.

  More specifically, the fuel gas remaining without reacting with the oxidant in the fuel cell 19 returns from the fuel gas inlet 46a to the condensate water chamber 46 of the fuel gas humidifier 25 from the fourth fuel gas path 38a. It flows in with the condensed water and stays once. The fuel gas in the condensed water chamber 46 is supplied from the exhaust fuel gas outlet 46b to the fuel processing device 24 through the fuel gas discharge path 38b. The moisture (water vapor) of the condensed water in the condensed water chamber 46 is transmitted to the supply fuel gas chamber 47 by the action of allowing the moisture of the moisture transfer film (water vapor permeable film) 25c to permeate.

  The condensed water chamber 46 is provided with a fuel gas cooling water chamber 45 through a partition plate 25b made of a material having good thermal conductivity. The condensed water flowing into the exhausted fuel gas chamber 46 is heated to about 75 ° C. when leaving the fuel cell 19, but remains in the condensed water chamber 46 and the temperature drops to about 50 ° C. However, since the temperature of the cooling water in the fuel gas cooling water chamber 45 is always maintained at about 75 ° C., which is the temperature when leaving the fuel cell 19, the condensed water in the condensed water chamber 46 is heated to a constant temperature.

  Therefore, the condensed moisture (water vapor) that has passed through the supply fuel gas chamber 47 is also at a predetermined temperature, and the condensed moisture exchanges wet heat with the supply fuel gas flowing through the supply fuel gas chamber 47 to humidify the supply fuel gas.

  Here, in the fuel gas humidifier 25, if the cooling water and the exhausted fuel gas flow to face each other via the partition plate 25b, the heat transfer from the fuel cooling water to the condensed water is more efficient. If the condensed water and the supplied fuel gas flow oppositely through the moisture transfer membrane (water vapor permeable membrane) 25c, the transfer of moisture from the condensed water to the supplied fuel gas is further enhanced. It is done efficiently.

  As described above, in the first embodiment, the fuel gas supplied to the fuel cell 19 is converted into the heat, moisture, and water of the exhaust fuel gas and the fuel cooling water reacted in the fuel cell 19 via the moisture transfer film 23. Since the heat is exchanged and supplied to the fuel cell 19 in a humidified state, the deterioration of the electrolyte membrane can be suppressed, the durability of the fuel system can be improved, and a highly efficient system can be provided. Due to the unitized configuration, it is possible to reduce the cost, reduce the number of man-hours, and improve the quality when manufacturing the fuel cell system.

  Further, since the fuel gas humidifier 25 is configured by disposing the fuel cooling water in the center and insulating it from the outer surface, the fuel gas humidifier 25 further suppresses the temperature drop of the fuel cooling water, and further exchanges the moist heat of the fuel gas. A highly efficient system can be provided.

(Embodiment 2)
The fuel gas humidifier 25 that is a feature of the second embodiment of the present invention will be described. 3, 5, and 7 are explanatory diagrams for explaining the configuration of the humidifying device 25 and the wet heat exchange action in the fuel cell system shown in FIG. 1. 3, 5, and 7, the fuel gas humidifier 25 and the oxidant gas humidifier 21 have the same configuration, and the fuel gas humidifier 25 will be described here.

  That is, the fuel gas humidifier 25 is provided with a supply fuel gas chamber 47 in the center, a moisture transfer film 25c on the outer periphery of the supply fuel gas chamber 47, and a partition plate 25b provided on the outer periphery of the moisture transfer film 25c. A condensate water chamber 46 is formed between them, and a fuel cooling water chamber 45 is formed between the outer wall 25a and the partition plate 25b.

  As described above, in the second embodiment, the area of the partition plate that transfers the temperature of the fuel cooling water or the oxidant cooling water is ensured to be equal to or larger than the area of the moisture transfer film, and the temperature of the condensed water chamber is sufficiently high. Since the temperature can be raised, the wet heat exchange from the exhaust fuel gas or exhaust oxidant gas to the supply fuel gas or supply oxidant gas can be sufficiently performed, and the fuel gas or oxidant gas having a high dew point is supplied to the fuel cell. Therefore, a high-performance and highly durable fuel cell system can be provided.

  As described above, the fuel cell system according to the present invention improves the energy efficiency of the entire system, and can be downsized and stably operated, and can be applied to electric vehicles and the like.

Schematic diagram showing the configuration of the fuel cell system according to Embodiment 1 of the present invention. The longitudinal cross-sectional view which shows the structure and wet heat exchange effect | action of a fuel gas humidifier in Embodiment 1 The longitudinal cross-sectional view which shows the structure and wet heat exchange effect | action of a fuel gas humidifier in Embodiment 2 Side sectional view which shows the structure of the fuel gas humidifier in Embodiment 1 Side sectional view which shows the structure of the fuel gas humidifier in Embodiment 2 Left side view of the fuel gas humidifier in the first embodiment Left side view of another fuel gas humidifier in the second embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 19 Fuel cell 20 Air supply apparatus 21 Oxidant gas humidifier 23 Fuel supply apparatus 24 Fuel processing apparatus 25 Fuel gas humidifier 25a Outer wall 25b Partition plate 25c Moisture transfer film 25d, 25e Fixed member 26 Cooling water radiator 27 Cooling water tank 28 Cooling water pump 29 Hot water storage tank 39 First cooling water path 40 Second cooling water path 41 Third cooling water path 42 Fourth cooling water path 43 Hot water pump 44 Hot water circulation path 45 Fuel gas cooling water chamber 45a Fuel Gas cooling water inlet 45b Fuel gas cooling water outlet 46 Condensed water chamber 46a Exhaust fuel gas inlet 46b Exhaust fuel gas outlet 47 Supply fuel gas chamber 47a Supply fuel gas inlet 47b Supply fuel gas outlet

Claims (5)

  A fuel cell that generates power using a fuel gas and an oxidant gas; and a fuel gas humidifier that humidifies a supply fuel gas supplied to the fuel cell. The fuel gas humidifier is discharged from the fuel cell. The moisture contained in the discharged fuel gas or the discharged oxidant gas is heated with cooling water that has cooled the heat during power generation of the fuel cell, and the supplied fuel gas is humidified through a moisture transfer film. The fuel gas humidifier is formed in a cylindrical shape, is partitioned into a hollow shape by a moisture transfer membrane disposed inside the outer wall thereof, and is further formed into a hollow shape by a partition plate disposed inside the moisture transfer membrane. The supply fuel gas is supplied between the outer wall and the moisture transfer membrane, the exhaust fuel gas is supplied between the partition plate and the moisture transfer membrane, and the fuel cooling water is provided inside the partition plate. Supply It charges the battery system.   A fuel cell that generates electric power using a fuel gas and an oxidant gas; and an oxidant gas humidifier that humidifies a supply oxidant gas supplied to the fuel cell, wherein the oxidant gas humidifier includes the fuel cell. The moisture contained in the discharged fuel gas or the discharged oxidant gas discharged from the fuel cell is heated with the cooling water that has cooled the heat during power generation of the fuel cell, and the supplied oxidant gas is humidified through the moisture transfer film The oxidant gas humidifier is formed in a cylindrical shape, and is partitioned into a hollow shape by a moisture transfer membrane disposed on the inner side of the outer wall, and further a partition plate disposed on the inner side of the moisture transfer membrane. The supply oxidant gas is supplied between the outer wall and the moisture transfer membrane, the exhaust oxidant gas is supplied between the partition plate and the moisture transfer membrane, and the partition plate Inside the oxidizer cooling The fuel cell system for supplying.   A fuel cell that generates power using a fuel gas and an oxidant gas; and a fuel gas humidifier that humidifies a supply fuel gas supplied to the fuel cell. The fuel gas humidifier is discharged from the fuel cell. The fuel gas humidifier is configured to heat the water contained in the discharged fuel gas with cooling water that has cooled the heat generated during power generation of the fuel cell and humidify the supplied fuel gas through the moisture transfer film. Is formed in a cylindrical shape, and is partitioned into a hollow shape by a partition plate disposed inside the outer wall, and is further partitioned into a hollow shape by a moisture transfer membrane disposed inside the partition plate, and the partition wall is separated from the outer wall. A fuel cell system in which the fuel cooling water is supplied between plates, the exhaust fuel gas is supplied between the partition plate and the moisture transfer membrane, and the supplied fuel gas is supplied inside the moisture transfer membrane.   A fuel cell that generates electric power using a fuel gas and an oxidant gas; and an oxidant gas humidifier that humidifies a supply oxidant gas supplied to the fuel cell, wherein the oxidant gas humidifier includes the fuel cell. The moisture contained in the discharged oxidant gas discharged from is heated with cooling water that has cooled the heat at the time of power generation of the fuel cell to humidify the supplied oxidant gas through the moisture transfer film, The oxidant gas humidifier is formed in a cylindrical shape, and is partitioned into a hollow shape by a partition plate disposed inside the outer wall, and is further partitioned into a hollow shape by a moisture transfer membrane disposed inside the partition plate. The oxidant cooling water is supplied between the outer wall and the partition plate, the exhaust oxidant gas is supplied between the partition plate and the moisture transfer film, and the supply oxidant gas is supplied inside the moisture transfer film. Supply fuel cell system Beam.   The fuel cell system according to any one of claims 1 to 4, wherein the moisture transfer membrane is a plurality of hollow fiber membranes.

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