阅读说明：本技术 燃料电池系统 (Fuel cell system ) 是由 北泽畅祐 M·法约勒 田村聪 林隆夫 于 2019-04-29 设计创作，主要内容包括：本公开的一种燃料电池系统(100),具备燃料电池(10)、再生器(20)、燃料气体供给路径(50)、加湿器(51)和水回收路径(4),燃料电池(10)具有阳极(11)和阴极(12),并通过在阴极(12)中使介体还原来生成电力；在再生器(20)中使介体氧化；要被供给到阳极(11)的燃料气体在燃料气体供给路径(50)中流动；加湿器(51)配置在燃料气体供给路径(50)上,用于对燃料气体进行加湿；水回收路径(4)从再生器(20)延伸到加湿器(51),用于将选自再生器(20)中生成的水蒸气和由水蒸气生成的冷凝水中的至少一种引导至加湿器(51)。(A kind of fuel cell system (100) of the disclosure, have fuel cell (10), regenerator (20), fuel gas feed path (50), humidifier (51) and water recycling path (4), fuel cell (10) has anode (11) and cathode (12), and generates electric power by making mediator reduction in cathode (12)；Mediator is aoxidized in regenerator (20)；It is fed into fuel gas flowing in fuel gas feed path (50) of anode (11)；Humidifier (51) configures on fuel gas feed path (50), for humidifying to fuel gas；Water recycles path (4) and extends to humidifier (51) from regenerator (20), for will be selected from the guidance of at least one of the vapor generated in regenerator (20) and the condensed water generated by vapor to humidifier (51).)

1. a kind of fuel cell system has fuel cell, regenerator, fuel gas feed path, humidifier and water recycling road Diameter,

The fuel cell has anode and cathode, and generates electric power by making mediator reduction in the cathode；

Aoxidize the mediator in the regenerator；

The fuel gas for being fed into the anode flows in the fuel gas feed path；

The humidifier configuration is on the fuel gas feed path, for humidifying to the fuel gas；

Water recycling path extends to the humidifier from the regenerator, the water for will generate in the regenerator At least one of steam and the condensed water generated by the vapor are guided to the humidifier.

2. fuel cell system according to claim 1, is also equipped with condenser, the condenser arrangement is recycled in the water On path, the condensed water is generated for condensing the vapor being discharged from the regenerator.

3. fuel cell system according to claim 2, wherein on the direction parallel with gravity, the condenser is matched It sets in the position more closer to the top than the humidifier.

4. fuel cell system according to claim 2 is also equipped with oxidant feed path,

The oxidant feed path is connect with the regenerator, and is used for the flowing of oxidant, and the oxidant is used in institute It states and aoxidizes the mediator in regenerator,

The condenser is the oxidant for making to flow in the oxidant feed path and recycles in path in the water The heat exchanger of heat exchange occurs for the vapor of flowing,

The oxidant is heated in the condenser by the vapor.

5. fuel cell system according to claim 1, is also equipped with circulating path, the circulating path is electric by the fuel Pond is connected with the regenerator, so that the cathode and the regenerator of the solution containing the mediator in the fuel cell Between recycle.

Technical field

This disclosure relates to fuel cell system.

Background technique

In previous fuel cell, hydrogen is oxidized in anode, and oxygen is reduced in cathode.The hydrogen reduction speed of cathode is slow. This is the main reason for causing fuel cell reaction efficiency to decline.As the fuel cell that can overcome the disadvantage, developing Redox flow flow pattern fuel cell.

Redox flow flow pattern fuel cell refers to that with the reaction of at least one of cathode and anode mediated via mediator The fuel cell that is characterized of reaction.In redox flow flow pattern fuel cell, for example, supplying hydrogen to anode, and to yin Pole supplies mediator solution.

In general, the system using redox flow flow pattern fuel cell has for making the regenerated regenerator (patent of mediator Document 1).Mediator is regenerated by regenerator, and regenerated mediator is supplied again to cathode, fuel cell can be repeated In reaction.For example, contacting air with mediator solution in a regenerator, the chemical reaction of the Reduction Body and oxygen of mediator is carried out. Mediator is regenerated into oxysome as a result,.

Summary of the invention

In the system using redox flow flow pattern fuel cell, water is generated with the regenerative response of mediator.

The water generated in effective use regenerator improves the energy efficiency of fuel cell system.

The disclosure provides a kind of fuel cell system, which has fuel cell, regenerator, fuel gas Feed path, humidifier and water recycle path,

The fuel cell has anode and cathode, and generates electric power by making mediator reduction in the cathode；

Aoxidize the mediator in the regenerator；

The fuel gas for being fed into the anode flows in the fuel gas feed path；

The humidifier configuration is on the fuel gas feed path, for humidifying to the fuel gas；

Water recycling path extends to the humidifier from the regenerator, for that will generate in the regenerator Vapor and the guidance of at least one of the condensed water that is generated by the vapor to the humidifier.

According to the disclosure, the energy efficiency of fuel cell system can be improved.

Detailed description of the invention

Fig. 1 is the composition figure for the fuel cell system that disclosure first embodiment is related to.

Fig. 2 is the composition figure of the condenser of fuel cell system shown in Fig. 1.

Fig. 3 is the composition figure for the fuel cell system that disclosure second embodiment is related to.

Fig. 4 is the composition figure for the fuel cell system that disclosure third embodiment is related to.

Fig. 5 is flow chart related with the control for the valve being arranged on exhaust pathway.

Fig. 6 is flow chart related with the control for the valve being arranged on drainage path.

Specific embodiment

(the basic opinion of the disclosure)

When the regenerative response with mediator generates water, the mediator concentration in mediator solution is reduced.When the concentration of mediator When reduction, reaction efficiency decline, and the power generation performance decline of fuel cell system.Therefore, it is necessary to by remaining water to outside Eject the concentration for maintaining mediator.

The water by generating in effective use regenerator is expected to reduce the energy loss in fuel cell system.

Present inventor considered that the water generated in regenerator to be used for the humidification of fuel gas, so as to complete the disclosure Fuel cell system.

The summary of one side (this disclosure relates to)

The fuel cell system that the first aspect of the disclosure is related to has fuel cell, regenerator, fuel gas supply road Diameter, humidifier and water recycle path,

The fuel cell has anode and cathode, and generates electric power by making mediator reduction in the cathode；

Aoxidize the mediator in the regenerator；

The fuel gas for being fed into the anode flows in the fuel gas feed path；

The humidifier configuration is on the fuel gas feed path, for humidifying to the fuel gas；

Water recycling path extends to the humidifier from the regenerator, for that will generate in the regenerator Vapor and the guidance of at least one of the condensed water that is generated by the vapor to the humidifier.

According in a first aspect, the energy efficiency of fuel cell system 100 improves.

In the second aspect of the disclosure, for example, the fuel cell system that first aspect is related to can also have condenser, The condenser arrangement is on water recycling path, for condensing to generate the vapor being discharged from the regenerator The condensed water.According to second aspect, in humidifier, efficiently fuel gas can be humidified.

In the third aspect of the disclosure, for example, in the fuel cell system that first or second aspect is related to, with again On the parallel direction of power, the condenser can be only fitted to the position more closer to the top than the humidifier.According to the third aspect, energy Enough without using ancillary equipments such as pumps, the condensed water generated by condenser is transported to humidifier.

In the fourth aspect of the disclosure, for example, the fuel cell system that the third aspect is related to can also have oxidant Feed path, the oxidant feed path are connect with the regenerator, and are used for the flowing of oxidant, and the oxidant is used for The mediator is aoxidized in the regenerator, the condenser can be the oxygen for making to flow in the oxidant feed path The agent and heat exchanger of heat exchange occurs for the vapor that flows in water recycling path, the oxidant can be It is heated in the condenser by the vapor.According to fourth aspect, energy loss is reduced, and the energy of fuel cell system Efficiency improves.

In the 5th aspect of the disclosure, for example, the fuel cell system that face is related to either in first~fourth aspect System is also equipped with circulating path, which connect the fuel cell with the regenerator, so that containing the mediator Solution recycles between the cathode and the regenerator of the fuel cell.

In the following, being described with reference to embodiment of the present disclosure.The present disclosure is not limited to following embodiments.

(first embodiment)

Fig. 1 shows the composition for the fuel cell system that disclosure first embodiment is related to.Fuel cell system 100 has Fuel cell 10 and regenerator 20.Fuel cell 10 is redox flow flow pattern fuel cell.Regenerator 20 and fuel cell 10 Connection, so that mediator solution can recycle between fuel cell 10 and regenerator 20.

Fuel cell system 100 has the usage amount for reducing expensive noble metal catalyst, can reduce overvoltage with reality The advantages that showing high generation efficiency, can be by using mediator solution to simplified cooling system.

Fuel cell 10 has anode 11 (fuel electrodes), cathode 12 (oxidizing agent pole) and dielectric film 13.Dielectric film 13 configurations are between anode 11 and cathode 12.13 constituting membrane electrode conjugant of anode 11, cathode 12 and dielectric film.Fuel electricity Pond 10 can be made of single battery unit, can also be made of the stacked body of multiple battery units.Fuel cell 10 by Oxygenated fuel gas and make mediator reduction in cathode 12 in anode 11, to generate electric power.Not only cathode 12, but also anode 11 The reaction at place is also possible to the reaction mediated via mediator.

Anode 11 is the electrode with porous structure.Electrode is for example made of conductive materials such as carbon materials.As carbon materials Material, such as vitreous carbon, carbon nanotube, carbon felt can be enumerated etc..In the case where directly making fuel gas oxidation in anode 11, example Such as, the catalyst such as platinum are supported on conductive material.In the case where carrying out the reaction at anode 11 using mediator, can save Slightly catalyst.

Cathode 12 is for example made of porous substrate.The porous substrate that can be used in anode 11 also can be used in cathode 12.In In fuel cell 10, the reaction at cathode 12 is carried out using mediator.Therefore, cathode 12 does not need the catalyst such as platinum.However, cathode 12 also can have catalyst.

Dielectric film 13 is the film with proton-conducting.The material of dielectric film 13 is not particularly limited.As electrolysis Plasma membrane 13 can enumerate fluorine-based polymer dielectric film, hydrocarbon system polymer dielectric film etc..As fluorine-based polymer dielectric film, The perfluorinated sulfonic acids polyelectrolyte membranes such as Nafion (registered trademark of DuPont) can be enumerated.It is electrolysed as hydrocarbon system polymer Plasma membrane can be enumerated using the high molecular dielectric film of hydrocarbon for introducing proton acid groups (proton conductive group).As hydrocarbon high score Son can enumerate engineering plastics, general-purpose plastics etc..As engineering plastics, polyether-ether-ketone, polyether-ketone, polyether sulfone, polyphenylene sulfide can be enumerated Ether, gathers to benzene etc. polyphenylene oxide.As general-purpose plastics, polyethylene, polypropylene, polystyrene etc. can be enumerated.As proton acidic group Group, can enumerate sulfonic acid group, carboxylic acid group, phosphate group, boric acid base group etc..

Regenerator 20 is for example made of container 21.Regenerator 20 plays the role of aoxidizing mediator.Container 21 has can The inner space of storage media solution.Container 21 is also possible to the container with thermal insulation.

Regenerator 20 can also have bubbler 22.Bubbler 22 is for manufacturing the fine foam of oxidant to promote oxygen The component of agent and mediator solution contact.Bubbler 22 is configured in the inside of container 21.In the present embodiment, in container 21 Bubbler 22 is configured on bottom surface.Oxidant is supplied externally to bubbler 22.Oxidant from bubbler 22 spray, on one side with Jie Liquid solution contact rises on one side.Mediator is oxidized as a result,.In the present embodiment, oxidant is gas.Typically, oxidant The oxygen (oxygen) being included in air.

Regenerator 20 can also have heater 23.Heater 23 can be only fitted to the inside of container 21, can also configure In the outside of container 21.Heater 23 can directly be contacted with mediator solution, and the heat of heater 23 can be passed via container 21 It is delivered to mediator solution.In the present embodiment, the configuration of heater 23 is in the inside of container 21.Heater 23 is, for example, that resistance-type adds Hot device.By connecting heater 23, mediator solution can be heated.Thus, it is possible to which the temperature of mediator solution is made to rapidly rise to fit Close the temperature of regenerative response.In turn, if using heater 23, the temperature of mediator solution can be maintained at temperature appropriate Degree, and the generation of the vapor from mediator solution can be promoted.

Mediator solution includes mediator and solvent.The type of mediator is not particularly limited.Mediator for example can be multi-metal oxygen Hydrochlorate, metal ion or metal complex.As polyoxometallate, phosphomolybdic acid, phosphorus vanadic acid, phosphotungstic acid etc. can be used.It is more Oxometallate is for example with metals such as vanadium, molybdenum, tungsten.As metal complex, porphyrin metal complex can be enumerated, had TEMPO (2,2,6,6- tetramethyl piperidine 1- oxygroup) as ligand metal complex, there is oxidizing ferment or derivatives thereof conduct The metal complex etc. of ligand.As oxidizing ferment, galactose oxidase, bilirubin oxidase, glucose oxidase etc. can be enumerated. It may include a variety of mediators in mediator solution.The type of solvent is also not particularly limited.As solvent, water, sulfuric acid water can be enumerated Solution, phosphate aqueous solution etc..The pH of solution can be acidity.It may include electrolyte appropriate in mediator solution.

The concentration of mediator solution mediator is suitably adjusted, so that the reaction in cathode 12 successfully carries out.Mediator it is dense Degree can be adjusted according to the type of mediator.The concentration of POM is for example when mediator solution is POM aqueous solution, in POM aqueous solution It is to be also possible to 0.1mol/ liter or more more than 0.05mol/ rises.

Fuel cell system 100 is also equipped with circulating path 30.Circulating path 30 connects fuel cell 10 and regenerator 20.It is logical Circulating path 30 is crossed, mediator solution can recycle between the cathode 12 and regenerator 20 of fuel cell 10.It in detail, can be with The mediator restored by cathode 12 is aoxidized in regenerator 20, and is supplied again to cathode 12.Thereby, it is possible to make in cathode 12 Reaction successfully carries out.

Pump 31 is provided on circulating path 30.When pump 31 is run, mediator solution is by circulating path 30 in cathode 12 It is recycled between regenerator 20.In the present embodiment, circulating path 30 has first path 30a and the second path 30b.First The taphole of path 30a connection regenerator 20 and the entrance of cathode 12.The outlet and regeneration of second path 30b connection cathode 12 The solution inlet of device 20.Pump 31 can be set on first path 30a, also can be set on the second path 30b.It can also be All configuration pumps 31 in first path 30a and the second path 30b.

The first path 30a of circulating path 30 and the second path 30b can be made of at least one pipeline respectively.It is recycling In path 30, the component, such as connector, filter, valve, flowmeter, sensor etc. in addition to pump 31 can also be configured.These It is also applied for other aftermentioned paths.

Fuel cell system 100 is also equipped with fuel gas feed path 50 and humidifier 51.Fuel gas feed path 50 It is the flow path of the fuel gas flow of anode 11 to be fed into.Fuel gas is, for example, hydrogen-containing gas.Fuel gas supplies road Diameter 50 is stretched out from fuel gas source is (not shown), and is connected to anode 11.As fuel gas source, reformer, hydrogen storage can be enumerated Tank etc..

Humidifier 51 configures on fuel gas feed path 50.Fuel gas is when passing through humidifier 51 in humidifier 51 In it is humidified.Thereby, it is possible to the fuel gas after humidifying to the supply of anode 11.

Humidification method in humidifier 51 is not particularly limited.As humidification method, bubble, shower type etc. can be enumerated. Bubble is that mode of the fuel gas to be humidified is injected in liquid phase water.Shower type be to fuel gas injection water to The mode humidified.

Fuel cell system 100 is also equipped with water recycling path 40.Water recycles path 40 and extends to humidifier from regenerator 20 51.Path 40 is recycled by water, it will be in the vapor that generated in regenerator 20 and the condensed water generated by the vapor At least one is guided to humidifier 51.The remaining water and heat being discharged from regenerator 20 can be made again in humidifier 51 With, therefore can be improved the energy efficiency of fuel cell system 100.

That is, according to the present embodiment, it can be in the case where being not necessarily to successively supply water externally to humidifier 51 in fuel The inside supply water of battery system 100 (so-called water is self-supporting).Thus, for example, not needing to be replaced as frequently as using from city The ion exchange resin that metal ion is removed in water, can reduce the operating cost of fuel cell system 100.Furthermore it is possible to The vapor and/or condensed water of 51 moderate supply high-temperature of humidifier, therefore freezing for winter humidifier 51 can be prevented.It can be with It omits for preventing heater freezed etc., the energy efficiency of fuel cell system 100 improves as a result,.

Fuel cell system 100 is also equipped with condenser 44.For the configuration of condenser 44 on water recycling path 40, being used for will be from again The vapor condensation that raw device 20 is discharged is to generate condensed water.It includes upstream portion 40a and downstream part that water, which recycles path 40, 40b.Upstream portion 40a is the part between regenerator 20 and condenser 44.By upstream portion 40a, from regenerator 20 Vapor is conveyed to condenser 44.Downstream part 40b is the part between condenser 44 and humidifier 51.Pass through downstream portion Divide 40b, condensed water is conveyed from condenser 44 to humidifier 51.It, can be in humidifier if supplying condensed water to humidifier 51 Efficiently fuel gas is humidified in 51.The type of workable humidifier 51 also increases.

Fuel cell system 100 is also equipped with oxidant feed path 42.Oxidant feed path 42 is connected to regenerator 20. In detail, oxidant feed path 42 is connected to the bubbler 22 of regenerator 20.Oxidant feed path 42 is oxidant stream Dynamic flow path, the oxidant is for aoxidizing mediator in regenerator 20.Oxidation is provided on oxidant feed path 42 Agent feeder 46.Oxidant feeder 46 plays the role of supplying oxidant to regenerator 20 by oxidant feed path 42. As long as oxidant can be blown into mediator solution, the type of oxidant feeder 46 is not particularly limited.Oxidant supply Device 46 is, for example, air blower.

Fig. 2 shows the compositions of condenser 44.Condenser 44 be the oxidant that makes to flow in oxidant feed path 42 and The heat exchanger of heat exchange occurs for flowing water steam in water recycling path 40.Condenser 44 has first flow path 44a and the Two flow path 44b.First flow path 44a is attached to the flow path in water recycling path 40.The vapor being discharged from regenerator 20 is first It is flowed in flow path 44a.Second flow path 44b is attached to the flow path of oxidant feed path 42.The oxygen to be supplied to regenerator 20 Agent flows in second flow path 44b.First flow path 44a for example passes through the inside of second flow path 44b.Oxidant is in condenser 44 Middle gas (the vapor and oxidant) heating for being flowed through second flow path 44b.Gas (the vapor being discharged from regenerator 20 And oxidant) flowed through first flow path 44a in the second flow path 44b of condenser 44 oxidant it is cooling.

In the present embodiment, in order to regenerate mediator, from the outside of fuel cell system 100 to regenerator 20 for oxygen supply Agent.When contacting cryogenic oxygen agent and mediator solution, the temperature of mediator solution is reduced, and the reaction of mediator regenerative response Speed reduces.By the way that the heat of the vapor being discharged from regenerator 20 and oxidant is supplied to regenerator 20 to be fed into Oxidant, so that the temperature of the oxidant of regenerator 20 to be fed into be made to rise, the temperature for being able to suppress mediator solution is reduced. As a result, being able to suppress the reduction of the reaction speed of mediator regenerative response.In turn, it is steamed by the water that will be discharged from regenerator 20 The heat of gas and oxidant is supplied to the oxidant of regenerator 20 to be fed into, to reduce to fuel cell system 100 The external heat being discharged.As a result, energy loss is reduced, the energy efficiency of fuel cell system 100 is improved.

As long as can cool down vapor and generate condensed water, the type of condenser 44 is not particularly limited.As available In the heat exchanger of condenser 44, tube-in-tube heat exchanger, heat-exchangers of the plate type, fin tube type heat exchanger, two-tube can be enumerated Formula heat exchanger etc..As shown in Fig. 2, condenser 44 also can have the heat exchange structure of convection type.That is, being discharged from regenerator 20 The flow direction of vapor can also be opposite with the flow direction of oxidant of regenerator 20 to be fed into.

It, can also in order to inhibit the temperature for the oxidant being heated in condenser 44 to reduce in oxidant feed path 42 To set heat insulation structural for oxidant feed path 42.For example, poly- ammonia can be used by constituting the piping of oxidant feed path 42 The heat-barrier materials such as ester foam cladding.

In order to inhibit the temperature from the vapor that regenerator 20 is discharged to drop at the upstream portion 40a in water recycling path 40 It is low, heat insulation structural can also be set by the upstream portion 40a that water recycles path 40.It is cold in order to inhibit to be generated by condenser 44 The temperature of condensate reduces at the downstream part 40b in water recycling path 40, and water can also be recycled to the downstream part 40b in path 40 It is set as heat insulation structural.For example, polyurethane foam etc. can also be used by constituting each piping of the downstream part 40b in water recycling path 40 Heat-barrier material cladding.Same heat insulation structural can also be set by the piping for constituting the upstream portion 40a in water recycling path 40.

In condenser 44, as the fluid for cooling down vapor, the fluid in addition to oxidant can be used.Example Such as, can by air by vapor it is cooling after, by the air be vented directly to the outside of fuel cell system 100 without It is supplied to regenerator 20.

In the present embodiment, on the direction (Z-direction) parallel with gravity, condenser 44 is configured more than humidifier 51 Position against the top.According to this structure, the condensed water generated by condenser 44 can be transported to humidifier 51 by gravity, Without using the ancillary equipments such as pump.But it is also possible to by the effect of the ancillary equipments such as pump, from condenser 44 to humidifier 51 Supply condensed water.

" condenser 44 is configured in the position more closer to the top than humidifier 51 ", which refers to, for example meets following positional relationship.Work as water Recycle path 40 downstream part 40b and condenser 44 link position be located at than water recycling path 40 downstream part 40b with When the link position of humidifier 51 position closer to the top, it can be determined that configure for condenser 44 more closer to the top than humidifier 51 Position.

Then, the working principle of fuel cell system 100 is illustrated.In fuel cell system 100, fuel gas The type of body, mediator and oxidant is not particularly limited.In the following, as an example, to using hydrogen as fuel gas, use Oxygen is illustrated as the case where oxidant.

The hydrogen as fuel gas is supplied to the anode 11 of fuel cell 10.In anode 11, hydrogen molecule is separated into Proton (H⁺) and electronics (e^-).Later, proton passes through the inside of dielectric film 13 and is moved to cathode 12.Electronics passes through external electrical Road is simultaneously moved to cathode 12.

In the present embodiment, mediator solution is supplied to the cathode 12 of fuel cell 10.The mediator that mediator solution is included It is reduced in cathode 12, from oxysome (Med_ox) become Reduction Body (Med_red) and be discharged from cathode 12.In the fuel cell 10 Mediator after reaction is in reducing condition, is supplied to regenerator 20 by circulating path 30.Pass through oxidant feed path 42 Oxidant is supplied to the inside of regenerator 20.In regenerator 20, the mediator of reducing condition is oxidized, and mediator is reproduced.

The temperature for the mediator solution being stored in regenerator 20 is adjusted, to generate water by mediator solution with speed appropriate Steam.Heater 23 can be used to adjust temperature.The vapor generated in regenerator 20 recycles the upper of path 40 by water Trip part 40a is directed to condenser 44.When passing through the first flow path 44a of condenser 44, vapor is by condenser 44 The oxidant (air) flowed in second flow path 44b is cooling and condenses.Condensed water recycles the downstream part 40b in path 40 by water It is directed to humidifier 51, for humidifying to fuel gas.The oxidant being heated is directed to regenerator 20, and being used for will Mediator oxidation.

With the operating of fuel cell 10, remaining fuel gas is discharged from anode 11.Remaining fuel gas is for example logical It crosses anode waste gas path 52 and is fed into burner and burning for heated reformate device (not shown).Remaining fuel gas has When also sufficiently diluted with air after discharge into the atmosphere.Remaining fuel gas can also be recycled at anode.In In this case, circulating path (not shown) is set, remaining fuel gas is guided from anode waste gas path 52 to fuel gas Body feed path 50.

In the following, being illustrated to other several embodiments.To being total between first embodiment and other embodiments Same element marks identical appended drawing reference, omits their explanation sometimes.Explanation related with each embodiment, as long as in skill Not contradiction in art, so that it may mutually be applicable in.As long as technically, contradiction, each embodiment not can be combined with each other yet.

(second embodiment)

Fig. 3 shows the composition for the fuel cell system that second embodiment is related to.Fuel cell system 200 and first is implemented The fuel cell system 100 of mode is the difference is that be omitted condenser 44.In humidifier 51, to fuel gas into It is not that in the case where must using liquid water, can suitably omit condenser 44 when row humidification.

In the present embodiment, humidifier 51 for example can be the Total heat exchange type humidifier using doughnut.Make With in the Total heat exchange type humidifier of doughnut, fuel gas is by the hollow portion of doughnut, during water or vapor pass through Flow path outside hollow fiber.Vapor penetrates doughnut, and humidifies to fuel gas.

(third embodiment)

Fig. 4 shows the composition for the fuel cell system that third embodiment is related to.Fuel cell system 300 is also equipped with setting Water tank 60 in water recycling path 40.Specifically, downstream part 40b of the configuration of water tank 60 in water recycling path 40.Storage Water pot 60 temporarily stores condensed water.By water tank 60, the water supplied to humidifier 51 can be suitably adjusted.In other words, It can prevent from excessively supplying water to humidifier 51.

Water tank 60 also acts as the effect of gas-liquid separation.It is including vapor and conduct from the gas that regenerator 20 is discharged The air of oxidant.A part of vapor becomes condensed water in condenser 44.In water tank 60, it can will be steamed containing water The gas and condensed moisture of gas and air from.

Specifically, fuel cell system 300 has exhaust pathway 64 and drainage path 66.Exhaust pathway 64 and draining road Diameter 66 is connect with water tank 60 respectively, and extends to the outside of fuel cell system 300, such as fuel cell system 300 The outside of framework.Valve 74 is provided on exhaust pathway 64.Valve 75 is provided on drainage path 66.Valve 74 and valve 75 can be Open and close valve is also possible to flow control valve.When opening valve 74, gas (mainly air) can be by exhaust pathway 64 from storage Water pot 60 is discharged to the outside.Thereby, it is possible to reduce the pressure inside water tank 60.When opening valve 75, condensed water can pass through Drainage path 66 is discharged to the outside from water tank 60.

Valve 73 and filter 76 are provided on water recycling path 40.Valve 73 is between water tank 60 and humidifier 51 and matches It sets on water recycling path 40.Valve 73 can be open and close valve, be also possible to flow control valve.By control valve 73, can adjust It is fed into the flow of the condensed water of humidifier 51.Filter 76 is between condenser 44 and water tank 60 and configures in water time It receives on path 40.Filter 76 plays the role of penetrating condensed water and go from condensed water deimpurity.The type of filter 76 It is not particularly limited.As filter 76, perforated membrane, amberplex or their combination can be used.

Humidifier 51 is connect with water supply path 62.Valve 72 and filter 77 are provided on water supply path 62.Water supply path 62 be the path for supplying water (for example, urban water) to humidifier 51.When opening valve 72, city is supplied to humidifier 51 Use water.When water deficiency in humidifier 51, urban water is fed to humidifier 51 by water supply path 62, so as to persistently right Fuel gas is humidified.Filter 77 plays the role of penetrating urban water and go from urban water deimpurity.Filtering The type of device 77 is also not particularly limited.As filter 77, perforated membrane, amberplex or their group can be used It closes.

Valve 71 is provided on fuel gas feed path 50.Valve 71 can be open and close valve, be also possible to flow control valve. By control valve 71, the flow of the fuel gas in fuel gas feed path 50 can be controlled.

Fuel cell system 300 is also equipped with pressure sensor 81.Pressure sensor 81 detects the pressure inside water tank 60. Pressure sensor 81 is for example installed on water tank 60.As long as being able to detect that the pressure inside water tank 60, pressure sensor 81 There is no limit for position.Pressure sensor 81 can be only fitted in water recycling path 40 filter 76 and water tank 60 it Between, it also can be only fitted between water tank 60 and valve 73.The type of pressure sensor 81 is not particularly limited.As pressure sensing Device 81 can enumerate capacitance pressure transducer, resistance wire type pressure sensor and piezoelectric electro resistance pressure transducer etc..It is humidifying Liquid level sensor 82 is installed on device 51.Liquid level sensor 82 detects the water level in humidifier 51.The type of liquid level sensor 82 Also it is not particularly limited.As liquid level sensor 82, float type liquid level sensor, capacitance level transducer, ultrasound can be enumerated Wave liquid level sensor etc..The other sensors such as water level sensor, temperature sensor also can be set in water tank 60.It is humidifying Also the other sensors such as pressure sensor, temperature sensor can be set in device 51.

Fuel cell system 300 is also equipped with controller 83.Controller 83 is obtained from pressure sensor 81 and liquid level sensor 82 Take detection signal, and control valve 74 and 75.As controller 83, can be used including A/D conversion circuit, imput output circuit, DSP (the Digital Signal Processor of computing circuit, storage device etc.；Digital signal processor).In controller 83 In be stored with program for operating fuel cell system 300 suitably.

Fig. 5 shows flow chart related with the control for the valve 74 being arranged on exhaust pathway 64.Controller 83 is regularly held Each processing step of flow chart shown in row Fig. 5.In step sl, the internal pressure P of water tank 60 is detected using pressure sensor 81. In step s 2, judge the internal pressure P detected whether more than threshold pressure Pth.When internal pressure P is more than threshold pressure Pth, Valve 74 is opened into the predetermined time to execute exhaust.It is lower than threshold pressure Pth thereby, it is possible to maintain the pressure of water tank 60 Pressure, therefore the breakage of the components such as fuel cell 10, regenerator 20, water tank 60, condenser 44 can be prevented.Threshold pressure Pth can be set as the pressure more substantially low than the pressure that each component can bear.

It should be noted that valve 74 also could alternatively be capillary.When using capillary, it can make inside water tank 60 Pressure keep constant, without carry out electrical control.

Fig. 6 shows flow chart related with the control for the valve 75 being arranged on drainage path 66.Controller 83 is regularly held Each processing step of flow chart shown in row Fig. 6.In step s 11, the valve 73 for being set to water recycling path 40 is opened, to humidification Device 51 supplies condensed water.In step s 12, the water level H in humidifier 51 is detected using liquid level sensor 82.In step s 13, Judge the water level H detected whether more than threshold level Hth.When water level H is more than threshold level Hth, valve 73 is closed Predetermined time is to stop supplying water to humidifier 51.It is lower than threshold level Hth thereby, it is possible to maintain the water level in humidifier 51 Water level.

It should be noted that the management of the water level of humidifier 51 is not required.Humidifier 51 is also configured to, in water Remaining water is overflowed and is discharged to the outside when being more than threshold level Hth in position.Industrial availability

Technology disclosed in this specification can be used for fuel cell system.

Description of symbols

10: fuel cell

11: anode

12: cathode

13: dielectric film

20: regenerator

21: container

22: bubbler

23: heater

30: circulating path

30a: first path

30b: the second path

40: water recycles path

40a: upstream portion

40b: downstream part

42: oxidant feed path

44: condenser

44a: first flow path

44b: second flow path

46: oxidant feeder

50: fuel gas feed path

51: humidifier

52: anode waste gas path

60: water tank

62: water supply path

64: exhaust pathway

66: drainage path

71,72,73,74,75: valve

76,77: filter

81: pressure sensor

82: liquid level sensor

83: controller

100,200,300: fuel cell system