JP2008098019A - Humidifier for fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact humidifier for a fuel cell which is used for removing impurity ions included in produced water while restraining pressure loss of an oxidation gas supply/discharge passage. <P>SOLUTION: This humidifier 3 for a fuel cell is provided with: a humidification module 16 recovering produced water included in exhaust air in a reaction gas discharge passage from a fuel cell body, and humidifying a reaction gas in a reaction gas supply passage to the fuel cell body; and an impurity ion reducing module 17 arranged on the upstream side of the humidification module 16 in the reaction gas discharge passage, and an impurity ion reduction body 21 reducing impurity ions included in liquid water discharged from the fuel cell body in a housing 30 shared with the humidification module 16. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel cell humidifier, and in particular, collects generated water contained in exhaust gas in a reaction gas discharge path from the fuel cell body, and humidifies intake air in the reaction gas supply path to the fuel cell body. The present invention relates to a humidifier for a fuel cell.

In a fuel cell, for example, a polymer electrolyte fuel cell (PEFC), an electrolyte membrane made of a fluororesin ion exchange membrane that is a proton conductor is usually used, and an anode and a cathode made of a catalyst layer and a gas diffusion layer are formed on both sides of the electrolyte membrane. The MEA (Membrane Electrode Assembly) is configured. When a fuel gas such as hydrogen is allowed to flow on the anode side of the MEA and a reaction gas such as oxygen is allowed to flow on the cathode side of the MEA, a chemical reaction occurs in both catalyst layers. On the anode side, hydrogen is separated into protons (H ⁺ ) and electrons (e ⁻ ), and these protons move in the electrolyte membrane with water molecules. On the other hand, electrons move to the cathode side through an external circuit. On the cathode side, oxygen in the oxidant reacts with protons and electrons moved from the anode side to produce water (hereinafter referred to as produced water). Therefore, the electrolyte membrane requires water molecules for proton transfer and must be kept in a proper wet state.

  For this reason, the generated water discharged from the fuel cell main body (fuel cell stack) is recovered by a fuel cell humidifier, and the recovered generated water is reused for humidification of the fuel cell main body. FIG. 8 shows a schematic configuration of the fuel cell system. A fuel cell humidifier 3 is installed across the oxidizing gas supply path 6 and the oxidizing gas discharge path 7 in the oxidizing gas supply path 1 for supplying and discharging the oxidizing gas to and from the fuel cell body 4 by the compressor 5. The generated water discharged from the battery body 4 is collected in the oxidizing gas discharge path 7, and only the water vapor is moved into the oxidizing gas supply path 6 by a humidified film (not shown). As a result, the oxidizing gas supplied to the fuel cell body 4 through the oxidizing gas supply path 6 is humidified. Note that the pressures of the oxidizing gas supply and the oxidizing gas exhaust are respectively controlled by the pressure regulating valve 8. Here, on the side of the oxidizing gas supply path 6, the inlet to the fuel cell humidifier 3 is referred to as “dry in” 9, and the outlet is referred to as “dry out” 10. On the side of the oxidizing gas discharge path 7, the inlet to the fuel cell humidifier 3 is referred to as a wet in 11, and the outlet is referred to as a wet out 12.

  FIG. 9 is a perspective view showing a configuration of a general fuel cell humidifier 3. The fuel cell humidifier 3 includes a first manifold 14 to which the dry-in 9 and the wet-out 12 are connected, a second manifold 15 to which the wet-in 11 and the dry-out 10 are connected, a first manifold 14, The humidifying element 13 is connected to the two manifolds 15. Here, the first manifold 14, the second manifold 15, and the humidifying element 13 are collectively referred to as a humidifying module 16. Further, the second manifold 15 includes a wet-in side manifold 18 and a dry-out side manifold 19.

  In FIG. 10, the outline | summary of the humidification means in the inside of the conventional humidification module 16 is shown with the simplified explanatory drawing. Exhaust gas containing generated water discharged from the fuel cell main body 4 flows in from the wet-in 11 and is discharged from the wet-out 12. The liquid water contained in the exhaust gas is distributed as water vapor around the hollow fiber membrane 41 in the humidification module 16 and penetrates into the hollow fiber membrane 41. On the other hand, the intake air flowing in from the dry-in 9 passes through the inside of the hollow fiber membrane 41, and at that time, is humidified by the permeated water vapor and discharged from the dry-out 10. Here, the hollow fiber membrane 41 refers to a hollow fiber having a filtration function, and there are special slit-shaped ultrafine pores on the wall surface of the hollow fiber, which allows water vapor to permeate by pressure. Due to the above action, the intake air flowing in from the dry-in 9 can make the electrolyte membrane in an appropriate wet state. A number of small circles shown in FIG. 10 are explanatory symbols described so that the distribution and movement of liquid water and water vapor contained in the exhaust and intake air can be easily understood.

  The generated water generated by the fuel cell body 4 contains various ions, which affect the performance of the ion exchange membrane and the humidifying membrane. For example, a fluoropolymer ion exchange membrane of a polymer electrolyte fuel cell (PEFC) generates hydrofluoric acid when it deteriorates, which causes glass reinforced fibers in the resin to dissolve and silica ions to be contained in the generated water. It is. This silica ion is deposited on the humidified film, causing clogging, and lowers the humidifying performance of the humidified film. Further, from the fluororesin ion exchange membrane of the polymer electrolyte fuel cell (PEFC), non-volatile sulfate ions are eluted from the sulfone group as the base material due to deterioration of the membrane, and are contained in the generated water. The sulfate ions are deposited and concentrated on the humidified film, and the humidified film is hydrolyzed and deteriorated. Furthermore, heavy metal ions such as stainless steel (SUS) and aluminum are generated from the piping and the like and are contained in the generated water. The heavy metal ions pass through the humidifying membrane and promote deterioration of the electrolyte membrane.

  In order to reduce various ions contained in the generated water generated by the fuel cell main body 4, it is preferable to provide an ion exchanger in the oxidizing gas supply / discharge path 1. However, the installation of the ion exchanger in the oxidizing gas supply / discharge path 1 has various technical problems and has not yet been implemented. As the reason, first, the oxidizing gas supply / discharge path 1 generates a larger amount of generated water than the fuel gas supply / discharge path 2. For this reason, the ion exchanger using the fine pellet-like ion exchange resin for filtering the produced water becomes a filter for the flow path, and the pressure loss of the piping becomes excessive. In addition, when the ion exchange resin containing the generated water is frozen, the piping is closed and the pressure loss of the piping is further increased. This also causes a problem that the ion exchanger itself requires its volume and it is difficult to secure a space for mounting.

  Patent Document 1 discloses a fuel cell system in which an ion exchange filter is installed on the upstream side of a humidifier. FIG. 11 is a configuration diagram of the fuel cell system disclosed in Patent Document 1. Here, a humidified water supply path 36 is provided separately from the oxidant supply / discharge path 33. A humidifier 35 that humidifies hydrogen and air is installed in the humidified water supply path 36. An ion exchange filter 34 is provided upstream of the humidifier 35 to remove ions in the pure water. The produced water discharged from the fuel cell stack 31 is once stored in the pure water tank 37 and circulated by the pump 40.

  Patent Document 2 discloses a fuel cell system that suppresses electrolyte deterioration caused by impurity ions (Pb) contained in water or water vapor for humidification. Here, a humidification path for collecting water and / or water vapor discharged from the polymer electrolyte fuel cell is provided, and water is separated from the exhaust gas by the air-gas / liquid separator and sent to the humidifier. As a method for removing impurity ions (Pb), disposing an ion exchanger on the inner surface of an air-gas-liquid separator is disclosed. Further, it is disclosed that a humidifier module made of a resin hollow fiber is provided as a humidifier, and an ion exchanger is used as the resin hollow fiber.

JP 2005-85481 A JP 2006-107773 A

  In the fuel cell system disclosed in Patent Document 1, a humidified water supply path must be installed separately from the oxidant supply / discharge path. For this reason, the route of the fuel cell system becomes complicated. Moreover, an excessive installation space is required in the fuel cell system, such as requiring a separate tank. Moreover, since an ion exchange filter is installed on the humidified water supply path, pressure loss occurs, and the capacity of the pump increases in order to supply humidified water. Furthermore, there is a possibility that the humidified water is contaminated by a pipe that connects the humidifier and the ion exchanger.

  In the fuel cell power generation system disclosed in Patent Document 2, the humidification path is the same path as the oxidant gas supply device, and a resin hollow fiber made of an ion exchanger is used as a filter. As described above, the oxidizing gas supply / discharge path has a larger flow rate of generated water than the fuel gas supply / discharge path. Therefore, if the generated water is passed through the resin hollow fiber that is an ion exchanger, an excessive pressure loss on the system occurs. Moreover, since the ion exchanger containing produced water closes the air passage during freezing, it causes further pressure loss. Furthermore, since this system requires a large amount of ion exchanger, it requires installation space.

  As described above, when the humidifier is provided in the oxidizing gas supply / discharge path where the flow rate of the generated water is large, it is difficult to reduce the pressure while suppressing the installation space and to make the system compact.

  An object of the present application is to solve this problem and to provide a compact humidifier for a fuel cell that removes impurity ions contained in generated water while suppressing pressure loss in an oxidizing gas supply / discharge path.

  In order to achieve the above object, a humidifier for a fuel cell according to the present invention collects generated water contained in exhaust gas in a reaction gas discharge path from the fuel cell body, and in the reaction gas supply path to the fuel cell body. Humidification module for humidifying the reaction gas and impurities provided on the upstream side of the humidification module in the reaction gas discharge path, and impurities that reduce impurity ions contained in the liquid water discharged from the fuel cell body in the same housing as the humidification module And an impurity ion reduction module having an ion reduction body.

  In the fuel cell humidifier, the impurity ion reduction module has a liquid water passage tank through which liquid water contained in the exhaust discharged from the fuel cell body passes, and the impurity ion reduction body has a liquid water passage tank. It is preferable to reduce impurity ions from the liquid water that passes.

  In the fuel cell humidifier, the impurity ion reduction module is preferably connected to the piping of the reaction gas discharge path above the liquid water passage tank in the gravity direction.

  In the fuel cell humidifier, the impurity ion reduction module is preferably connected to the humidification module along the longitudinal direction of the humidification module, and the exhaust discharged from the fuel cell main body is distributed to the humidification module.

  In the fuel cell humidifier, the impurity ion reduction module preferably separates the exhaust discharged from the fuel cell main body into gas and liquid water.

  In the fuel cell humidifier, the impurity ion reduction module preferably has a gas passage through which gas passes, and the gas passage is preferably provided on the outer periphery of the liquid water passage tank.

  In the fuel cell humidifier, the liquid water channel tank is preferably provided with an endothermic fin on the outer periphery thereof.

  Further, the humidifier for the fuel cell has a liquid water flow path tank that forms a liquid water flow path by providing a plurality of partition plates in the internal space where the impurity ion reducing body is provided. It is preferable that the height is substantially the same as the entrance.

  In the fuel cell humidifier, the flow path provided in the liquid water flow path tank is preferably a U-shaped flow path in the vertical direction.

  In the fuel cell humidifier, the impurity ion exchange module is preferably detachable from the humidification module.

  In the fuel cell humidifier, the humidification module preferably has a port for discharging liquid water.

  With the above configuration, the fuel cell humidifier includes a humidification module having a function of humidifying intake air in the oxidizing gas supply path and an impurity ion reduction module for reducing impurity ions contained in the discharged generated water. This impurity ion reduction module is installed in the manifold of the conventional humidification module and is replaced with a space for distributing the exhaust. Accordingly, the discharged liquid water can be dispersed and processed. Thereby, it becomes possible to suppress the pressure loss of the oxidizing gas supply / discharge path.

  In addition, the impurity ion reduction module of the fuel cell humidifier has a common humidifier module and housing. As will be described later, the impurity ion reduction module is replaced with a space that was conventionally a manifold of the humidification module. This enables a compact installation space.

  In the fuel cell humidifier, since the humidifying module and the impurity ion reducing module have a common housing, the impurity ion reducing module can be installed at the shortest distance upstream of the humidifying module. Thereby, it becomes possible to minimize the impurity ion which flows out out of piping etc. and is contained in product water.

  As described above, according to the fuel cell humidifier of the present invention, a compact fuel cell humidifier that removes impurity ions contained in the generated water while suppressing pressure loss in the oxidizing gas supply / discharge path is provided. Is possible.

  Embodiments according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a schematic configuration of one embodiment of a fuel cell humidifier. FIG. 2 shows a cross-sectional view of the fuel cell humidifier 3 of FIG.

  As shown in FIG. 1, the fuel cell humidifier 3 has a first manifold 14 having two ports, a dry-in 9 and a wet-out 12, and two ports, a wet-in 11 and a dry-out 10. The second manifold 15 and the humidifying element 13 that connects the first manifold 14 and the second manifold 15 are configured. Furthermore, an impurity ion reduction module 17 that incorporates the wet-in side manifold 18 is provided in a portion of the wet-in side manifold 18 (see FIG. 9) that is connected to the wet-in 11 of the second manifold 15. In the present embodiment, the first manifold 14, the second manifold 15 excluding the impurity ion reduction module 17, and the humidifying element 13 are collectively referred to as a humidifying module 16.

  As shown in FIG. 2, the impurity ion reduction module 17 includes a housing 30 common to the humidification module 16, a wet-in side manifold 18, a liquid water passage tank 20 having an impurity ion reduction body 21, and a gas passage. 23. As will be described later, liquid water in the exhaust gas flowing in from the wet-in 11 permeates the liquid water channel tank 20, and gas passes through the gas channel 23. That is, in the impurity ion reduction module 17, gas-liquid separation between liquid water and gas is performed.

  As shown in FIG. 8, the humidification module 16 collects the generated water contained in the exhaust gas in the oxidizing gas discharge path 7 from the fuel cell body 4 and takes in the intake gas in the oxidizing gas supply path 6 to the fuel cell body 4. Humidify. Here, as shown in FIG. 1, the impurity ion reduction module 17 is provided on the upstream side of the humidification module 16 in the oxidizing gas discharge path 7. That is, as shown in FIG. 2, the impurity ion reduction module 17 is installed on the upper side of the second manifold 15 that is a component of the humidification module 16. Therefore, the impurity ion reduction module 17 is included in the generated water immediately before the generated water passes through the humidifying module 16 and circulates, and immediately before the generated water passes through the humidifying element 13 including the humidifying film (not shown). Impurity ions can be removed. With this configuration, it is possible to prevent the humidified film from being clogged or deteriorated in advance by silica ions, sulfate ions, or the like contained in the generated water.

  Further, the impurity ion reduction module 17 is installed adjacent to the second manifold 15 in the same housing as the humidification module 16. That is, in the second manifold 15 of the conventional humidification module 16 shown in FIG. 9, the impurity ion reduction module 17 is installed so as to share the space occupied by the wet-in side manifold 18. That is, as shown in FIG. 2, the impurity ion reduction module 17 is installed in a common housing with the humidification module 16. The impurity ion reduction module 17 has a function of distributing the exhaust gas of the conventional wet-in side manifold 18 and a function of newly removing impurity ions. This makes it possible to minimize elution of heavy metal ions from pipes and the like.

  The impurity ion reduction module 17 is connected to the oxidizing gas discharge path 7 by the wet-in 11 above the position of the liquid water passage tank 20 in the gravitational direction. That is, the wet-in 11 is installed in the portion indicated by the one-dot chain line 11 in the wet-in side manifold 18 of FIG. As a result, the liquid water contained in the exhaust gas flowing into the wet-in side manifold 18 falls due to gravity while decreasing the flow velocity, and gradually permeates into the liquid water channel tank 20, so that ions are efficiently removed. Done.

  Further, as shown in FIG. 1, the impurity ion reduction module 17 is connected to the humidification module 16 along the longitudinal direction thereof, and distributes the exhaust discharged from the fuel cell body 4 to the humidification module 16. That is, similarly to the wet-in side manifold 18 of the conventional humidifying module 16 shown in FIG. 9, the exhaust gas containing the generated water is dispersed and processed by the manifold having a certain distance. Therefore, the flow rate per unit area of the impurity ion reduction module 17 is reduced, and the pressure loss of the exhaust can be suppressed.

  As shown in FIG. 2, the impurity ion reduction module 17 is installed adjacent to the upstream side of the humidification module 16. Further, as described above, it is also installed in the space occupied by the wet-in side manifold 18 conventionally. This enables a fuel cell humidifier 3 with high space efficiency.

  Here, FIG. 3 shows an enlarged cross-sectional view of the flow path through which liquid water and gas of the exhaust gas flowing into the impurity ion reduction module 17 pass. Liquid water permeates from the wet-in manifold 18 through the liquid water inlet 25 of the liquid water channel tank 20 by the action of gravity, and penetrates into the gaps between the impurity ion reducing bodies 21 packed in the liquid water channel tank 20. Then, the liquid water channel tank 20 is filled. Then, the liquid water moves as indicated by a broken line in FIG. 3 due to the pressure from the wet-in side manifold 18 and is discharged from the liquid water outlet portion 26. As shown in FIG. 3, a partition plate 22 is attached in the liquid water channel tank 20 so as to form a U-shaped liquid water channel 24 in the vertical direction. Thereby, the liquid water flow path 24 in the liquid water flow path tank 20 becomes longer, and the impurity ions contained in the liquid water can be reliably removed by the impurity ion reducing body 21. Further, the U-shaped liquid water channel 24 is provided approximately symmetrically on both sides in the liquid water channel tank 20. Thereby, the flow rate of exhaust gas is reduced, and gas-liquid separation is performed reliably. Further, the gas from which the liquid water is separated from the waste water is cut back by the gas flow path forming plate 28, and is discharged through the gas flow path 23 surrounding the outer periphery of the liquid water flow path 24.

  As shown in FIG. 3, the liquid water inlet portion 25 and the liquid water outlet portion 26 of the liquid water passage tank 20 are installed at substantially the same height position. Thereby, the liquid water can permeate the entire impurity ion reducing body 21 in the liquid water channel tank 20 and can be maintained in a so-called “water-stretched state”. This is because impurity ions can move due to the presence of liquid water. Further, the liquid water penetrates into the liquid water channel tank 20 from the liquid water inlet portion 25 and is discharged from the liquid water outlet portion 26 via the U-shaped continuous liquid water channel 24. Therefore, the impurity ion reducing body 21 as a whole contacts the liquid water evenly, and the impurity ions can be efficiently removed.

  As described above, the liquid water and gas in the exhaust gas are separated, and the liquid water passage 24 and the gas passage 23 are formed. Therefore, even when the liquid water filled in the liquid water flow path 24 is frozen in winter, the gas flow path 23 is always secured, and the cross-sectional area of the gas flow path 23 is also secured. Pressure loss does not increase. Furthermore, since the heated gas passes around the liquid water passage 24 while exchanging heat, even if the liquid water in the liquid water passage 24 is frozen, it is thawed at an early stage and its function is restored.

  An outline of an embodiment for increasing the efficiency of the heat exchange is shown in FIG. 4A is a partial cross-sectional view of FIG. 3, and FIG. 4B is a cross-sectional view taken along line BB of FIG. 4A. In the present embodiment, heat absorbing fins 29 are formed of a material having excellent heat exchange efficiency, such as aluminum, on the partition plate 22 on the outer peripheral portion of the liquid water passage 24 and the portion facing the gas passage 23 of the gas passage forming plate 28. Install. The heat absorption fins 29 are flat plates and are attached to the partition plate 22 and the gas flow path forming plate 28 so as to protrude toward the gas flow path 23. The shape and attachment method of the heat sink fin 29 are not limited to this embodiment as long as the shape and attachment method are suitable for heat exchange between gas and liquid water.

  The impurity ion reducing body 21 of the impurity ion reducing module 17 is deteriorated in function due to use, and therefore needs to be replaced periodically. The impurity ion reduction module 17 of the present embodiment is detachably attached to the humidification module 16 by general bolt bonding or the like.

  The liquid water that has passed through the impurity ion reduction module 17 is moved by the hollow fiber membrane 41 (see FIG. 2) inside the humidifying element 13 in the state of water vapor. Further, the exhaust gas from which liquid water has been removed is discharged outside the vehicle. As shown in FIG. 3, the liquid water is drained from a drain port 27 attached to the bottom of the liquid water passage tank 20 and supplied upstream of the compressor 5 shown in FIG. It may be used as cooling water for adiabatic compression heating. Further, it may be used as cooling water that is sprayed on a radiator of a vehicle and uses latent heat of vaporization. Conventionally, in these applications, there is a possibility that the compressor 5 and the radiator may be corroded by the acid contained in the generated water. However, liquid water from which impurity ions have been removed can be used without any problem.

  FIG. 5 shows a schematic configuration of another embodiment of the fuel cell humidifier 3. In this embodiment, the impurity ion reduction module 17 has a vertically long shape and is detachably attached to the side portion of the second manifold 15. This position is a position where the dry-out side manifold 19 to which the dry-out 10 is connected is attached.

  In FIG. 6, the outline | summary of the humidification means inside the humidification module 16 in this embodiment is shown with the simplified explanatory drawing. The humidifying means in this case has a flow opposite to that of the conventional humidifying means of FIG. That is, the exhaust gas containing the generated water discharged from the fuel cell body 4 flows from the wet-in 11, passes through the hollow fiber membrane 41 inside the humidification module 16, and is discharged from the wet-out 12. The intake air that flows in from the dry-in 9 passes around the hollow fiber membrane 41, and during that time, liquid water and water vapor that pass through the hollow fiber membrane 41 permeate around the hollow fiber membrane 41 and become wet. Thus, the fuel flows out from the dry-out 10 and is supplied to the fuel cell body 4.

  Thus, by installing the impurity ion reduction module 17 at the position where the dry-out side manifold 19 is attached, each of dry and wet passing through the inside of the hollow fiber membrane 41 and the outside of the hollow fiber membrane 41 is provided. The flow path can be reversed. This is because the hollow fiber membrane 41 is capable of both penetration of water vapor from the inside to the outside and penetration of water vapor from the outside to the inside.

  FIG. 7 is a perspective view showing an embodiment in which the impurity ion reduction module 17 is separated from the humidification module 16 and configured alone. In this embodiment, the impurity ion reduction module 17 includes, as ports, a wet-in 11, a wet-out 12, and a liquid water drain port 27 from which impurity ions have been removed. In this case, the waste water may be supplied upstream of the compressor 5 shown in FIG. 8 and used directly as humidified water or as cooling water for adiabatic compression temperature rise of the compressor 5. Further, it may be used as cooling water that is sprayed on a radiator of a vehicle and uses latent heat of vaporization.

It is a perspective view showing a schematic structure of one embodiment of a humidifier for a fuel cell according to the present invention. It is AA sectional drawing of FIG. 1 which shows schematic structure of one Embodiment of the humidifier for fuel cells which concerns on this invention. FIG. 2 is an enlarged explanatory view of the AA cross section of FIG. 1 showing liquid water and gas flow paths in the exhaust gas flowing into the impurity ion reduction module. It is sectional drawing which shows the outline | summary of the heat sink fin which is embodiment which raises the heat exchange efficiency of liquid water and gas. It is sectional drawing which shows schematic structure of other embodiment of the humidifier for fuel cells. It is explanatory drawing which shows the outline | summary of the humidification method in the humidification module in the case of other embodiment. It is a schematic perspective view showing an embodiment when the impurity ion reduction module is separated from the humidification module and configured alone. It is explanatory drawing which shows schematic structure of a fuel cell system. It is a perspective view which shows the structure of the common humidifier for fuel cells. It is explanatory drawing which shows the outline | summary of the humidification method in a humidification module. 1 is a configuration diagram of a fuel cell system disclosed in Patent Document 1. FIG.

Explanation of symbols

  1 Oxidation gas supply / discharge path, 2 Fuel gas supply / discharge path, 3 Humidifier for fuel cell, 4 Fuel cell body, 5 Compressor, 6 Oxidation gas supply path, 7 Oxidation gas discharge path, 8 Pressure regulating valve, 9 Dry-in, 10 dry out, 11 wet in, 12 wet out, 13 humidifying element, 14 first manifold, 15 second manifold, 16 humidifying module, 17 impurity ion reduction module, 18 wet in side manifold, 19 dry out Side manifold, 20 liquid water channel tank, 21 impurity ion reducing body, 22 partition plate, 23 gas channel, 24 liquid water channel, 25 liquid water inlet, 26 liquid water outlet, 27 drain port, 28 gas channel formation Plate, 29 Endothermic fin, 30 Housing, 31 Fuel cell stack, 33 Oxidation Agent supply / discharge path, 34 ion exchange filter, 35 humidifier, 36 humidified water supply path, 37 pure water tank, 40 pump, 41 hollow fiber membrane.

Claims (11)

A humidifying module that collects the generated water contained in the exhaust gas within the reaction gas discharge path from the fuel cell body and humidifies the reaction gas within the reaction gas supply path to the fuel cell body;
Impurity ion reduction module having an impurity ion reduction body that is provided on the upstream side of the humidification module in the reaction gas discharge path and reduces impurity ions contained in the liquid water discharged from the fuel cell body in a common housing with the humidification module When,
A humidifier for a fuel cell comprising:   2. The fuel cell humidifier according to claim 1, wherein the impurity ion reduction module has a liquid water passage tank through which liquid water contained in exhaust discharged from the fuel cell main body passes, A humidifier for a fuel cell, wherein impurity ions are reduced from liquid water passing through a water channel tank.   3. The fuel cell humidifier according to claim 1, wherein the impurity ion reduction module is connected to the piping of the reaction gas discharge path above the liquid water flow path tank in the gravity direction. vessel.   4. The fuel cell humidifier according to claim 1, wherein the impurity ion reduction module is connected to the humidification module along a longitudinal direction of the humidification module, and the exhaust discharged from the fuel cell main body is humidified by the humidification module. A humidifier for a fuel cell, characterized by being distributed to the fuel cell.   5. The fuel cell humidifier according to claim 1, wherein the impurity ion reduction module separates exhaust gas discharged from the fuel cell main body into gas and liquid water. 6. humidifier.   6. The fuel cell humidifier according to claim 1, wherein the impurity ion reduction module has a gas flow path through which a gas passes, and the gas flow path is provided on an outer periphery of the liquid water flow path tank. A fuel cell humidifier.   The fuel cell humidifier according to any one of claims 1 to 6, wherein the liquid water passage tank includes an endothermic fin on an outer periphery thereof.   The fuel cell humidifier according to any one of claims 1 to 7, wherein the liquid water channel tank is provided with a plurality of partition plates in the internal space provided with the impurity ion reducing body to form a liquid water channel. The fuel cell humidifier is characterized in that the outlet portion of the flow path has substantially the same height as the inlet portion.   9. The fuel cell humidifier according to claim 8, wherein the flow path provided inside the liquid water flow path tank is a U-shaped flow path in the vertical direction.   The fuel cell humidifier according to any one of claims 1 to 9, wherein the impurity ion exchange module is detachable from the humidification module.   11. The fuel cell humidifier according to claim 1, wherein the humidification module has a port for discharging liquid water.

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