JP2007317520A - Fuel cell separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell separator contributing to stability of operation of a fuel cell by suppressing invasion of condensation water which is condensed in a reaction gas passage. <P>SOLUTION: The fuel cell separator 110 is provided with a manifold 120 to which a reaction gas is supplied, a reaction gas introducing passage 130 to be communicated with the manifold 120, a plurality of reaction part passages 134 which communicate with the reaction gas introducing passage 130 and in which parallel grooves are formed, and a contraction structure 150 which is installed between the reaction gas introducing passage 130 and the reaction part passages 134 and has apertures 154 corresponding to the reaction part passages 134. A liquid drop distribution structure 160 which is installed in the reaction gas introducing passage 130 and distributes the liquid water into a plurality of reaction part passages 134 is provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel cell separator, and more specifically to a fuel cell separator used in a fuel cell system operated in an overhumidified state.

  Although it has become an era when new technologies such as IT and biotechnology are deployed on a global scale, the energy industry is still one of the largest core industries. Recently, expectations for so-called new energy are increasing with the spread of environmental awareness including prevention of global warming. In addition to environmental properties, new energy can be produced in a distributed manner in close proximity to power consumers, so there are advantages in terms of transmission loss and power supply security. In addition, the development of new energy can be expected to have a secondary effect of creating new peripheral industries. New energy initiatives began in earnest with the oil crisis about 30 years ago, and now, renewable energy such as solar power generation, recycling energy such as waste power generation, high-efficiency energy such as fuel cells, and clean energy Energy such as new field energy represented by cars is in the stage of development for practical application.

  Among them, fuel cells are attracting attention because they have high energy conversion efficiency, water is the only byproduct of power generation, and power generation is stable without being affected by the weather. As one of such fuel cells, a polymer electrolyte fuel cell that operates at a low temperature of 100 ° C. or lower is known. This polymer electrolyte fuel cell is a stationary type including a residential type, a vehicle-mounted type or a portable type. It is regarded as one of the next generation standard power supplies for applications.

A polymer electrolyte fuel cell has a basic structure in which a polymer electrolyte membrane, which is an electrolyte membrane, is disposed between a fuel electrode (anode) and an air electrode (cathode). This is a device that supplies an oxidant containing oxygen to the battery and generates electricity by the following electrochemical reaction.
Fuel electrode: H ₂ → 2H ⁺ + 2e ⁻ (1)
Air electrode: 1 / 2O ₂ + 2H ⁺ + 2e ⁻ → H ₂ O (2)
At the fuel electrode, hydrogen contained in the supplied fuel is decomposed into hydrogen ions and electrons as shown in the above formula (1). Among these, hydrogen ions move inside the solid polymer film toward the air electrode, and electrons move through the external circuit to the air electrode. On the other hand, in the air electrode, oxygen contained in the oxidant supplied to the air electrode reacts with hydrogen ions and electrons that have moved from the fuel electrode, and water is generated as shown in the above formula (2). In this way, in the external circuit, electrons move from the fuel electrode toward the air electrode, so that electric power is taken out.

  A separator is provided outside the fuel electrode and the air electrode. A fuel flow path is provided in the separator on the fuel electrode side, and fuel is supplied to the fuel electrode. Similarly, an oxidant flow path is also provided in the separator on the air electrode side, and the oxidant is supplied to the air electrode. In this specification, the fuel and the oxidant are collectively referred to as “reactive gas”. In addition, a flow path of cooling water for cooling the electrodes is provided between these separators.

Here, the reaction gas is usually introduced after being humidified by a humidifier, but when cooled in the reaction gas supply manifold, a large amount of condensed water is generated. However, in the conventional fuel cell separator, there is no means for preventing cooling at the introduction portion from the reaction gas supply manifold to the reaction gas flow path, and the condensed water derived from the reaction gas is removed from the reaction gas of the separator. There are problems such as accumulation on the supply manifold and intrusion into the reaction gas channel from the reaction gas supply manifold. For this reason, in the conventional fuel cell separator, the flow path of the reaction gas is blocked by the condensed water, the supply of the uniform reaction gas to the electrode surface is obstructed, and the output of the fuel cell may be lowered.
JP 2004-220828 A

  A solid polymer membrane used as an electrolyte in a polymer electrolyte fuel cell expresses ionic conductivity in a wet state, so that the reaction gas is humidified and supplied so that the relative humidity is close to 100% or more than 100%. It is desirable to do. However, if the reaction gas is humidified and supplied so that the humidity is close to 100% relative humidity, there is a high possibility that the reaction gas will dew on the upstream side of the flow path provided in the separator.

  Therefore, in Patent Document 1, a nozzle plate having a convex tip is disposed at the inlet of the reaction gas flow path, and a water drainage flow path is provided, so that condensed water condensed at the reaction gas introduction part flows into the reaction gas flow path. A technique for discharging from a water drainage channel without entering is disclosed. However, in such a configuration, when a large amount of condensed water is generated, the condensed water enters from a specific inlet of the nozzle plate provided in the convex portion, and there is a possibility that the operation becomes unstable. .

  The present invention has been made in view of these problems, and an object of the present invention is to provide a fuel that contributes to stabilization of the operation of the fuel cell by suppressing the ingress of condensed water condensed into the reaction gas flow path. To provide a battery separator.

  The present invention has been made to solve the above-described problems, and a fuel cell separator according to the present invention includes a manifold to which a reaction gas is supplied, a reaction gas introduction passage communicating with the manifold, and the reaction gas. A plurality of reaction part flow paths communicating with the introduction path and forming parallel grooves, and an opening corresponding to the reaction part flow path, interposed between the reaction gas introduction path and the reaction part flow path The fuel cell separator includes a droplet distribution structure that is provided in the reaction gas introduction path and distributes liquid water to the plurality of reaction portion flow paths.

  As a result, moisture condensed in the reaction gas introduction path or water droplets that have entered the reaction gas introduction path are distributed to a plurality of reaction section flow paths by the droplet distribution structure, and the openings or openings provided in the specific throttle structure It can suppress that it concentrates and enters the reaction part flow path.

  Therefore, the operation of the fuel cell held by the fuel cell separator of the present invention can be stabilized.

  According to a second aspect of the present invention, in the fuel cell separator according to the first aspect, the droplet distribution structure extends to the reaction part flow path. The invention according to claim 3 is the fuel cell separator according to claim 2, wherein the droplet distribution structure has a moisture distribution function for supplying moisture from the reaction gas introduction channel to the reaction part channel. It is characterized by. As a result, the water distributed in the reaction gas introduction section is uniformly supplied to the reaction section flow path, the solid polymer membrane can be kept in a wet state, and the throttle structure can be clogged with liquid water. It can be avoided.

  According to the fuel cell separator of the present invention, it is possible to prevent the condensed water that has condensed into the reaction gas flow path from entering.

  Hereinafter, the fuel cell separator of the present invention will be described in detail with reference to the drawings. FIG. 1 is a system configuration diagram of a household fuel cell cogeneration system CGS using a fuel cell separator according to the present invention. A household fuel cell cogeneration system CGS reforms raw fuel (hydrocarbon fuel) such as LPG and city gas, and generates a reformed gas containing about 80% hydrogen (fuel); The fuel cell 10 that generates power by the reformed gas supplied from the reformer and oxygen (oxidant) in the air, and the heat generated from the reformer and the fuel cell 10 are converted into hot water (40 ° C. or higher water ) And a hot water storage device that recovers and stores hot water in the form of a system that has both a power generation function and a hot water supply function.

  Raw fuels such as LPG and city gas installed in homes are usually odorized by sulfides as a safety measure against gas leakage, but this sulfide degrades the catalyst in the reformer. In the reformer, first, sulfide in the raw fuel is removed by the desulfurizer 52. The raw fuel desulfurized by the desulfurizer 52 is then mixed with steam, steam reformed by the reformer 54, and introduced into the transformer 56. The reformer 56 produces reformed gas of about 80% hydrogen, about 20% carbon dioxide, and 1% or less carbon monoxide, but is operated at a low temperature (100 ° C. or less) that is easily affected by carbon monoxide. In the present system CGS for supplying the reformed gas to the fuel cell 10 to be processed, the reformed gas and oxygen are further mixed, and the carbon monoxide is selectively oxidized by the CO remover 58. The carbon monoxide concentration in the reformed gas can be reduced to 10 ppm or less by the CO remover 58.

  The reformer includes at least a reformer 54 and a transformer 56, and the desulfurizer 52 is used as the fuel cell 10 when the gas laid at home is used as a raw fuel as in this system CGS. In the case of using a low temperature type fuel cell 10 such as a solid polymer fuel cell, a CO remover 58 is further included.

  Since steam reforming is an endothermic reaction, the reformer 54 is provided with a burner 60. When starting the reformer, the raw fuel is also supplied to the burner 60 to raise the temperature of the reformer 54. When the system CGS can be stably operated, the supply of the raw fuel to the burner 60 is stopped. Then, by supplying unreacted fuel discharged from the fuel cell 10 to the burner 60, heat is supplied to the reformer 54. Since the exhaust after supplying heat to the reformer 54 by the burner 60 still has a large amount of heat, this exhaust is heat-exchanged with the water in the hot water storage tank 62 by the heat exchangers HEX01 and HEX02. Then, the water exchanges heat (HEX03) with the exhaust gas from the cathode 14 of the fuel cell 10 and further exchanges heat (HEX04) with the exhaust gas from the anode 22 and returns to the hot water storage tank 62. The water pipe 64 passing through the heat exchangers HEX01, HEX02, HEX03, and HEX04 can be used for raising or cooling the cathode-side humidification tank 66 depending on the temperature of water (hot water) after passing through the heat exchanger HEX04. Further, a branch pipe 68 is provided. When the temperature of the cathode-side humidification tank 66 is low, such as when the system CGS is started, water passes through the heat exchanger HEX04 and then passes through the branch pipe 68 to heat the cathode-side humidification tank 66 in the heat exchanger HEX05. After supplying, the hot water storage tank 62 is returned.

  The cathode side humidification tank 66 also functions as a cooling water tank, and the water in the cathode side humidification tank 66 cools the fuel cell 10 and returns to the cathode side humidification tank 66. As described above, when the temperature of the fuel cell 10 is low, such as when the system CGS is activated, the fuel cell 10 can be warmed by supplying the fuel cell 10 with the cooling water warmed by the heat exchanger HEX05. . The cooling water passage 70 through which the cooling water passes is connected to a heat exchanger HEX06 provided in the anode-side humidification tank 72, and the cooling water serves to make the temperatures of the cathode-side humidification tank 66 and the anode-side humidification tank 72 substantially the same. Also plays.

  The reformed gas from the reformer is humidified (bubbled in the case of the present system CGS) in the anode side humidification tank 72 and supplied to the anode 22. Unreacted fuel that has not contributed to power generation at the anode 22 is discharged from the fuel cell 10 and supplied to the burner 60. The fuel cell 10 is normally operated to generate power in the range of 70 to 80 ° C., and the exhaust gas discharged from the fuel cell 10 has a heat of about 80 ° C. Therefore, as described above, the heat exchanger HEX04 After the heat exchange at, the temperature of the water supplied to the cathode-side humidification tank 66 and the anode-side humidification tank 72 is further raised by the heat exchanger HEX07 and then supplied to the burner 60.

  The water supplied to the cathode-side humidification tank 66 and the anode-side humidification tank 72 is preferably clean water having low electrical conductivity and low contamination with organic substances. Supplied after water treatment with membrane and ion exchange resin. The water subjected to this water treatment is also used for steam reforming of the reformer 54. The clean water is also supplied to the hot water storage tank 62. At this time, the clean water is supplied from the lower part of the hot water storage tank 62. The water pipe 64 also draws water having a low temperature from the lower part of the hot water storage tank 62 and returns the water exchanged with each heat exchanger to the upper part.

  HEX10 is a total heat exchanger. Since the exhaust gas containing unreacted oxygen that has not contributed to power generation at the cathode 14 contains heat of about 80 ° C. and produced water generated by the reaction, it is supplied to the cathode 14 by the total heat exchanger HEX10. Supply heat and moisture to the air. The air supplied to the cathode 14 is further humidified (bubbling in the case of the present system CGS) in the cathode-side humidification tank 66 and then supplied to the cathode 14. On the other hand, heat and moisture are supplied to the total heat exchanger HEX 10. The supplied exhaust gas is further configured to be exchanged with water in the heat exchanger HEX03 and then discharged to the outside of the system CGS.

  FIG. 2 is a configuration diagram showing the configuration of the fuel cell separator 110 according to the present invention and the fuel cell 10 held between the fuel cell separator 110. The separator 110 for a fuel cell according to the present invention is made of a material obtained by mixing carbon powder and a phenol resin, and has a thickness of about 2 mm per sheet. It is 6 mm. The fuel cell separator 110 is provided with a gas supply manifold 120, a reaction gas introduction path 130, a throttle installation section 132, a reaction section flow path 134, a reaction gas discharge path 136, and a gas discharge manifold 122. The reaction gas supplied to the gas supply manifold 120 passes through the reaction gas introduction path 130, the introduction path expansion section 132, the reaction section flow path 134, and the reaction gas discharge path 136 in this order, and is then discharged to the gas discharge manifold 122. The

  Further, the fuel cell separator 110 includes a through hole 124 used as a reaction gas supply manifold paired with the reaction gas flowing in the flow path of the fuel cell separator 110, and the pair of reaction gas discharges. A through hole 125 used as a manifold is formed. Here, the reaction gas paired with the reaction gas flowing in the flow path of the fuel cell separator 110 is, for example, air containing oxygen when the reaction gas flowing in the flow path of the fuel cell separator 110 is a fuel gas containing hydrogen. On the contrary, when the reaction gas flowing in the flow path of the fuel cell separator 110 is an oxidant gas such as air containing oxygen, it is a fuel gas containing hydrogen. Further, the fuel cell separator 110 is formed with a through hole 126 used as a cooling water supply manifold and a through hole 127 used as a cooling water discharge manifold.

  The inlet of the reaction gas introduction path 130 communicates with the gas supply manifold 120. The reaction gas supplied to the gas supply manifold 120 is introduced into the reaction gas introduction path 130. The throttle installation section 132 is provided with a throttle structure 150 that narrows the flow path through which the reaction gas passes. The diaphragm structure 150 includes a plate 152 provided with a plurality of openings 154. The shape and diameter of the opening 154 are not particularly limited, but can be, for example, a circular shape of 200 μm to 1 mmφ. According to this, as the reaction gas passes through the opening 154 provided in the throttle structure 150, the flow velocity increases, and the reaction gas that has passed through the opening 154 becomes shower-like in a state of increasing momentum. It spouts toward the road 134. As a result, dew condensation at the inlet portion of the reaction section flow path 134 is suppressed. Further, even if condensed water due to condensation is generated, the condensed water is pushed away into the reaction part flow path 134 by the reaction gas and discharged to the reaction gas discharge path 136. Thereby, the influence of condensation is reduced and the operation of the fuel cell 10 is stabilized.

  The plurality of reaction section channels 134 are formed in a groove shape parallel to each other on one surface of the fuel cell separator 110, and the opening 154 provided in the throttle structure 150 is a position facing the reaction section channel 134. Is provided. As a result, since the reaction gas that has passed through the opening 154 is directly ejected to the reaction section flow path 134, the condensed water in the inlet of the reaction section flow path 134 and the reaction section flow path 134 can be more quickly discharged from the reaction section flow path 134. Can be discharged. Further, the cross-sectional area of the inlet of the reaction portion flow path 134 facing the opening 154 of the throttle structure 150 is equal to or larger than the opening cross-sectional area of the outlet portion of the throttle structure 150. Thereby, since the reaction gas ejected from the opening 154 is reliably supplied to the reaction part flow path 134 facing the opening 154 of the throttle structure 150, the clogging of the reaction part flow path 134 due to condensed water is more reliably suppressed. Is done.

  FIG. 3 is an enlarged schematic view showing in detail a portion of the throttle structure 150 of the fuel cell separator 110 according to this embodiment. Condensed water that has condensed on the upstream side of the throttle structure 150 or water droplets splashed in a liquid state from the humidifying tanks 66 and 72 and the gas supply manifold 120 may flow to a specific opening of the opening 154. . Therefore, a droplet distribution structure 160 that distributes water droplets to the reaction gas introduction path 130 is provided. Specifically, by providing a step (concave portion) of about 0.5 mm in the reaction gas introduction path 130, when a water droplet enters, the water droplet spreads laterally in the concave portion, and the water droplet is uniform in the throttle structure 150. It is made to be supplied to. As a more preferable form, a step is formed in a mountain shape so that the central portion of the droplet distribution structure 160 becomes higher (see FIG. 3B), and water droplets that have entered the reaction gas introduction path 130 from the gas supply manifold 120. Is received at the central portion, and is propagated through a concave portion formed obliquely toward the outside, so that water droplets are likely to spread laterally even if the step is lowered to about 0.2 mm. Thereby, clogging is suppressed by concentrating on a specific opening of the diaphragm structure 150, and the operation of the fuel cell 10 is stabilized.

  FIG. 4 is an enlarged schematic view showing in detail a portion of the throttle structure 250 of the fuel cell separator 210 according to this embodiment. A description of the same parts as those in the first embodiment will be omitted.

  In this embodiment, specifically, by providing a water-absorbing material in the reaction gas introduction path 230, when water droplets enter, the water-absorbing material absorbs and diffuses the water droplets, and the water droplets are uniformly distributed in the throttle structure 250. A droplet distribution structure 260 for distributing and supplying is provided in the reaction gas introduction path 230. As another form, when the water absorbing material is provided between the fuel cell separator 210 and the throttle structure 250 in the throttle installation portion 232 and the water droplet enters the throttle structure 250, the liquid droplet distribution structure 260 becomes a water droplet. It is also possible to function as a water flow passage that absorbs water and sends water to the reaction channel 234 by a concentration gradient of water. Further, as a more preferable form, by providing the droplet distribution structure 260 so as to straddle the reaction gas introduction path 230, the throttle installation section 232 and the reaction section flow path 234, it is ensured that water droplets reach the throttle structure 250. Water droplets may be absorbed so that no water droplets exist in the vicinity of the throttle structure 250, and the absorbed water may be sent out to the reaction channel 234. As a result, clogging of the throttle structure 250 is suppressed, and moisture can be uniformly supplied to the reaction portion flow path 234, so that the operation of the fuel cell 10 is further stabilized.

  In the home fuel cell cogeneration system CGS, the fuel cell 10 is sandwiched by using the fuel cell separator as in the first or second embodiment. FIG. 5 is a schematic diagram showing the configuration of the fuel cell 10. In the fuel cell 10, the gas diffusion layer is prepared by applying a carbon paste having a viscosity mainly composed of carbon black to a base material using carbon paper, carbon woven fabric or non-woven fabric as a base material. For the gas diffusion layer, a common carbon paper is used for the base material of both the gas diffusion layers 20 and 28 in consideration of productivity. In addition, the cathode side discharges generated water from the catalyst layer 14, and the anode side supplies humidified water to the solid polymer film 12, or is applied to the base material to have a function of retaining the solid polymer film 12. Different gas diffusion layer pastes (microporous layers) 16, 24 are used on the cathode side and the anode side. That is, the cathode-side microporous layer 16 produced by applying, drying, and heat-treating the gas diffusion layer paste on the base material blocks the gas supply path by the generated water, and the supply of the reaction fluid to the catalyst layer 14 is hindered. In order to prevent generation of water, the water repellency is lowered (the amount of fluororesin is reduced) from the anode side so as to draw the generated water from the catalyst layer 14 by utilizing a capillary phenomenon. On the other hand, the anode-side microporous layer 24 produced by applying, drying, and heat-treating the gas diffusion layer paste on the base material keeps the solid polymer film 12 moist by confining the moving water that has been reversely diffused from the cathode. High water repellency (a large amount of fluororesin).

  However, since general fluororesin (hereinafter referred to as polymer fluororesin) has binding properties, if a large amount of polymer fluororesin is introduced into the gas diffusion layer paste, the viscosity increases due to mixing and coating operations. Become a dumpling. Therefore, the coating process becomes very difficult. Therefore, the low molecular weight fluororesin has a property that the average molecular weight is smaller than that of the high molecular weight fluororesin and the binding property is very low, and the low molecular weight fluororesin has water repellency and the high molecular weight fluororesin has binding properties. Thus, each gas diffusion layer paste has water repellency and binding properties in a balanced manner. A specific method for manufacturing the diffusion layers 20 and 28 will be described below.

  Carbon paper (Toray Industries, Inc .: TGPH060H) serving as a base material for the gas diffusion layer is carbon paper: FEP (tetrafluoroethylene-hexafluoropropylene copolymer) = 95: 5 (for cathode), 60:40 by weight ratio. After being immersed in the FEP dispersion so as to be (for the anode), dried at 60 ° C. for 1 hour, and then subjected to heat treatment (FEP water repellent treatment) at 380 ° C. for 15 minutes. Thereby, the carbon paper is subjected to water repellent treatment almost uniformly. Carbon black (manufactured by CABOT: Vulcan XC72R), terpineol (manufactured by Kishida Chemical Co., Ltd.) as a solvent and triton (manufactured by Kishida Chemical Co., Ltd.) as a solvent, and a weight ratio of carbon black: terpineol: triton = 20: A carbon paste is prepared by mixing uniformly at room temperature with a universal mixer (manufactured by DALTON) so as to be 150: 3.

  The weight ratio of the low molecular fluorine resin (made by Daikin: Lubron LDW40E) and the high molecular fluorine resin (made by DuPont: PTFE30J) to the fluorine resin contained in the dispersion is low molecular fluorine resin: high molecular fluorine resin = 20. : Mix to make 3 to produce a mixed fluororesin for cathode. The carbon paste is put into a hybrid mixer container and cooled until the carbon paste reaches 10 to 12 ° C. The above-mentioned mixed fluororesin for cathode is put into the cooled carbon paste so that the weight ratio is carbon paste: mixed fluororesin for cathode (fluorine resin component contained in the dispersion) = 31: 1, and a hybrid mixer (KEYENCE) Mix in the mixing mode of EC500). The mixing stop timing is set until the paste temperature reaches 50 to 55 ° C., and the mixing time is adjusted appropriately. After the paste temperature reaches 50 to 55 ° C., the hybrid mixer is switched from the mixing mode to the defoaming mode to perform defoaming. The paste after defoaming is naturally cooled to complete the cathode gas diffusion layer paste.

  The carbon paste and the low molecular fluororesin are mixed in a hybrid mixer container with a weight ratio of carbon paste: low molecular fluororesin (hereinafter referred to as anode fluororesin) (fluororesin component contained in the dispersion) = 26. : Add to 3 and mix in the mixing mode of the hybrid mixer. After mixing, the hybrid mixer is switched from the mixing mode to the defoaming mode to perform defoaming. When the supernatant liquid accumulates on the upper part of the paste after defoaming, the supernatant liquid is discarded, and the paste is naturally cooled to complete the anode gas diffusion layer paste.

  Each gas diffusion layer paste cooled to room temperature is applied to the surface of the above-mentioned carbon paper subjected to FEP water repellent treatment so that the coating state in the carbon paper surface is uniform, and then applied to a hot air dryer (manufactured by Thermal). And dry. Finally, heat treatment is performed to complete the gas diffusion layer.

  The fuel cell 10 forms catalyst layers 14 and 22 on the surfaces of the gas diffusion layers 20 and 28 on which the gas diffusion layer paste is applied to form the microporous layers 16 and 24, and the solid polymer membrane (Nafion 112) 12. It is produced by sandwiching. The cathode-side catalyst layer 14 is a mixture of Pt-supported carbon and an electrolyte solution (20% Nafion solution) in a ratio of Pt-supported carbon: electrolyte solution = 3: 8, and the anode-side catalyst layer 22 is supported by Pt-Ru. Carbon and an electrolyte solution (20% Nafion solution) are prepared by mixing them in a ratio of Pt-Ru-supported carbon: electrolyte solution = 1: 2.

  INDUSTRIAL APPLICABILITY The present invention is effective as a fuel cell separator used in a fuel cell system that supplies a reaction gas to a fuel cell in a highly humidified state.

1 is a system configuration diagram of a household fuel cell cogeneration system using a fuel cell separator according to the present invention. FIG. It is a block diagram which shows the structure of the separator for fuel cells which concerns on this invention, and a fuel cell. 2 is an enlarged view showing in detail a portion of a throttle structure of a fuel cell separator according to Embodiment 1. FIG. 6 is an enlarged view showing in detail a portion of a throttle structure of a fuel cell separator according to Embodiment 2. FIG. It is sectional drawing which shows the structure of a fuel cell.

Explanation of symbols

10 ... Fuel cell 12 ... Solid polymer membrane (electrolyte layer)
14 ... Cathode side catalyst layer 16 ... Cathode side microporous layer (second diffusion layer)
18 ... Cathode side base material layer (first diffusion layer)
20 ... Cathode side diffusion layer 22 ... Anode side catalyst layer 24 ... Anode side microporous layer (second diffusion layer)
26 ... Anode-side base material layer (first diffusion layer)
DESCRIPTION OF SYMBOLS 28 ... Anode side diffused layer 52 ... Desulfurizer 54 ... Reformer 56 ... Transformer 58 ... CO remover 60 ... Burner 62 ... Hot water storage tank 64 ... Water piping 66 ... Cathode side humidification tank 68 ... Branch piping 70 ... Cooling water passage 72 ... Anode-side humidification tank 74 ... Water treatment device 76 ... Cooling water flow path 78 ... Hot water supply piping 110, 210 ... Fuel cell separator 120 ... Gas supply manifold 122 ... Gas discharge manifold 124 ... Through hole, 125 ... Through hole, 126 ... Through hole 127 ... Through hole 130, 230 ... Reaction gas introduction path 132, 232 ... Restriction installation part 134, 234 ... Reaction part flow path 136 ... Reaction gas discharge path 150, 250 ... Restriction structure 152 ... Plate 154 ... Opening 160, 260 ... Droplet distribution structure CGS ... Domestic fuel cell cogeneration system HEX01, H EX02, HEX03, HEX04, HEX05 ... heat exchanger

Claims (3)

A reaction gas supply passage, a reaction gas introduction passage communicating with the manifold, a plurality of reaction portion passages communicating with the reaction gas introduction passage and having parallel grooves formed therein, and the reaction gas introduction passage; In a fuel cell separator comprising: a throttle structure that is interposed between the reaction part flow path and provided with an opening corresponding to the reaction part flow path.
A separator for a fuel cell, comprising a droplet distribution structure provided in the reaction gas introduction channel and distributing liquid water to the plurality of reaction unit channels. The fuel cell separator according to claim 1, wherein
The separator for a fuel cell, wherein the droplet distribution structure extends to the reaction part flow path. The fuel cell separator according to claim 2, wherein
The fuel cell separator according to claim 1, wherein the droplet distribution structure has a water circulation function of supplying water from the reaction gas introduction path to the reaction section flow path.

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