WO2010108605A2 - Système de piles à combustible avec au moins une pile à combustible - Google Patents

Système de piles à combustible avec au moins une pile à combustible Download PDF

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Publication number
WO2010108605A2
WO2010108605A2 PCT/EP2010/001551 EP2010001551W WO2010108605A2 WO 2010108605 A2 WO2010108605 A2 WO 2010108605A2 EP 2010001551 W EP2010001551 W EP 2010001551W WO 2010108605 A2 WO2010108605 A2 WO 2010108605A2
Authority
WO
WIPO (PCT)
Prior art keywords
fuel cell
region
cell system
recirculation line
valve
Prior art date
Application number
PCT/EP2010/001551
Other languages
German (de)
English (en)
Other versions
WO2010108605A3 (fr
Inventor
Thorsten Tüxen
Cosimo Mazzotta
Thomas Baur
Klaus Scherrbacher
Matthias Jesse
Original Assignee
Daimler Ag
Ford Global Technologies, Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler Ag, Ford Global Technologies, Llc filed Critical Daimler Ag
Publication of WO2010108605A2 publication Critical patent/WO2010108605A2/fr
Publication of WO2010108605A3 publication Critical patent/WO2010108605A3/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04097—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with recycling of the reactants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K21/00—Fluid-delivery valves, e.g. self-closing valves
    • F16K21/02—Fluid-delivery valves, e.g. self-closing valves providing a continuous small flow
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
    • H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04104—Regulation of differential pressures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
    • H01M8/04156—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
    • H01M8/04164—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal by condensers, gas-liquid separators or filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells

Definitions

  • Fuel cell system with at least one fuel cell
  • the invention relates to a fuel cell system having at least one fuel cell according to the type defined in more detail in the preamble of claim 1. Furthermore, the invention relates to a method for operating such a fuel cell system, as well as a use thereof.
  • Such a construction of a fuel cell system with a recirculation line for returning the anode exhaust gas into the anode inlet is known, for example, from DE 101 15 336 A1.
  • anode loop nitrogen and water accumulate in the recirculated anode exhaust gas over time. Therefore, it is known from the general state of the art and described in the above-mentioned document that in the region of the recirculation line valve devices are arranged, which are opened from time to time to the nitrogen from the area of the recirculation line and the area of the anode space to blow off accordingly.
  • the "disposal" of this waste gas from the region of the anode loop can take place in different regions which typically each have a catalytic surface or are in connection with another component which has such a catalytic surface is therefore common because together with the nitrogen there will always also be a small amount of hydrogen in the vented gas, which can be rendered harmless in this way ..
  • DE In order to be able to remove the product water of the fuel cell arising in the region of the anode exhaust gas, DE Furthermore, a water separator in the region of the recirculation line is described.
  • the above construction requires at least one valve device for blowing off the nitrogen (purge) and at least one further valve device for the purge Draining the accumulated in the water separator (drain).
  • the components cause additional effort in terms of their control and any necessary sensor technology.
  • corresponding line elements must be present from the valve devices into the respective areas into which the media are discharged. This requires corresponding components and corresponding installation space. To be able to ensure a safe start and secure functionality of the system even at temperatures below freezing, these line elements must also be made correspondingly insulated and / or heated. This also causes great expense in terms of cost, complexity and weight in the fuel cell system shown above.
  • this structure can also be used to allow gas to flow from the region of the anode into the region of the cathode, namely whenever the pressure conditions are reversed (purge).
  • This is also used in the structure according to DE 103 11 785 A1, for example, to blow off the resulting carbon dioxide, or in the case of an anode loop, the nitrogen which accumulates, together with the carbon dioxide, into the region of the cathode.
  • the discharge of the media will generally take place via the overflow path, which is provided with a correspondingly narrow cross section.
  • a shutter or the like may be integrated into the overflow path to firmly set a corresponding cross section which matches the volumetric flows in the present fuel cell system.
  • the opening of the switchable flow path of the valve is typically always carried out only when necessary, that is, for example, if there is too low a hydrogen concentration in the region of the recirculation line and / or the anode compartment in order to realize the required power generation in the fuel cell of the fuel cell system.
  • By opening the switchable flow path drain water is then expelled very quickly and the purge function is started very quickly.
  • valve devices may be provided in the region of the recirculation line and / or the anode compartment.
  • the construction can be realized in a particularly efficient, simple and cost-effective manner if exactly one valve device is provided in the region of the recirculation line and / or the anode chamber according to a particularly favorable embodiment of the invention.
  • About this one valve device as a combined drain / purge valve can then be realized with minimal effort in terms of space, the sensor and the control a very simple, compact and efficient design. Due to the fürströmwegs in the valve device, it comes to a continuous outflow, first of the water and then a corresponding amount of gas. This can be dispensed with elaborate sensors, such as level sensors, for the water level. On the one hand, this saves costs and, on the other hand, makes it possible to free oneself of possible malfunctions of the very slightly polluting level sensors.
  • the overflow path can have a solid cross-section which is predetermined by the fuel cell system and can be flowed through.
  • this souströmbare cross section is designed as a diaphragm, wherein the diaphragm is realized as a flexible diaphragm whose opening cross-section changes automatically depending on the pressure difference on the two sides of the diaphragm.
  • a flexible diaphragm is still a passive device which does not require active driving or the like. It is therefore still very easy to implement cost-effectively and without the problem of malfunction.
  • the structure may for example be constructed in the form of a membrane, which deflects depending on the pressure difference between the one side and the other side accordingly. If one or more openings are now provided in the region of the membrane, its cross-section will be correspondingly larger in the case of a deflected membrane than in the case of a membrane that is not deflected. In extreme cases, it is thus possible to close the overflow path when the system is turned off so that, for example, no gases are exchanged between the areas connected via the valve device via the overflow path.
  • the membrane Only when the system is put into operation and a corresponding pressure difference between the one side and the other side occurs, the membrane will deform accordingly in the direction of lower pressure and the flexible diaphragm creates the flow-through opening cross-section, which flows through the overflow, for example allowed by drain water and purge gas.
  • the region of the recirculation line in this case has a water separator, wherein the valve device is arranged in the outlet region of the water separator.
  • the merging of drain and purge can be realized particularly efficiently in a single component. Separated water collects in the water separator, so that it can be assumed that the largest Amount of present in the region of the recirculation line and / or the anode chamber water collects in the region of this separator.
  • the valve device In the outflow region of the separator, typically in the direction of gravity below, the valve device is then arranged, which allows by its Kochströmweg a continuous outflow of water.
  • the construction with the water separator can do without the pollution-critical and cost-intensive level sensors, as a continuous flow of the accumulating water is ensured via the overflow.
  • the diameter of the overflow With appropriate selection of the diameter of the overflow so a very simple and efficient structure can be achieved, in which only minimal amounts of hydrogen flow from the recirculation line.
  • the structure according to the invention in such a way that media in two different states of aggregation are discharged via the valve device. Due to the nature of the liquids and the gases, with a suitable arrangement of the valve device, preferably in a water separator, the drainage function will always be carried out first until no more water is present in the corresponding lines to the valve device. Only after the water has flowed out via the valve device will there be a blow off of gases from the region of the recirculation line and / or the anode chamber.
  • the switchable flow path of the valve device in normal operation is not or only in exceptional circumstances, such as the operation of the Fuel cell system with high electrical power, opened accordingly. Therefore, it is provided according to a particularly favorable and advantageous development of the method that the switchable flow path of the valve device is always opened only when the hydrogen concentration in the recirculation line and / or the anode compartment falls below a predetermined value.
  • the drop in hydrogen concentration indicates the presence of a large volume of inert gas, especially nitrogen. If this is the case, then a very fast blowing off of this gas can be achieved by opening the switchable flow path. Only in such cases, therefore, the opening of the switchable flow path, so that losses of hydrogen from the region of the recirculation line and / or the anode compartment can be largely minimized.
  • the structure of the fuel cell system according to the invention and the operation of the method according to the invention are characterized in particular by simplicity, reliability and compactness. Therefore, both the fuel cell system and the method of operating such a system are particularly suitable for use in land, water and air transport. Since such means of transport, in particular passenger cars, are always realized under high cost pressure and rather small available installation space, these advantages play a particularly important role here.
  • the fuel cell system can typically provide the drive energy for such a means of transport, but it is also conceivable to generate only electrical energy for auxiliary drives via the fuel cell system, while the propulsion energy is otherwise obtained, for example, by internal combustion engines, turbomachines or the like.
  • Fig. 1 is a schematic representation of a fuel cell system in a possible
  • FIG. 2 shows a structure of a valve device in a first embodiment according to the invention
  • FIG. 3 shows a structure of a valve device in a second embodiment according to the
  • FIG. 4 shows a structure of a valve device in a third embodiment according to the
  • FIG. 5 shows a construction of a flow path with a flexible diaphragm.
  • a fuel cell system 1 is indicated in highly schematic form in a section relevant to the present invention.
  • the most important component of the fuel cell system 1 is a fuel cell 2, which is typically designed as a stack of individual fuel cells, as a so-called fuel cell stack.
  • the fuel cell 2 has an anode space 3 and a cathode space 4, which in the exemplary embodiments illustrated here should each be separated from one another by a proton-conducting membrane.
  • the fuel cell 2 is therefore a so-called PEM fuel cell stack.
  • the anode compartment 3 of the fuel cell 2 is supplied with hydrogen from the hydrogen storage device 5 from a hydrogen storage device 5 via a metering valve 6 and a line element.
  • unreacted hydrogen passes via a recirculation line 7 back into the region in which the fresh hydrogen flows via the metering valve 6 to the anode chamber 3.
  • the recirculation line 7 thus leads in a manner known per se unused gas from the region of the anode chamber 3 back into the anode space, wherein the gas mixed with fresh hydrogen from the hydrogen storage device 5.
  • a recirculation conveyor 8 is arranged in the region of the recirculation line 7, which ensures the return of the unused gas from the anode chamber 3.
  • the recirculation conveyor 8 can be designed as a hydrogen recirculation fan, as indicated in FIG. Additionally or alternatively, a gas jet pump would be conceivable, which is driven by the hydrogen from the hydrogen storage device 5, and sucks the gas from the region of the recirculation line 7, mixed with the fresh hydrogen and the anode chamber 3 feeds.
  • the cathode compartment 4 of the fuel cell 2 is supplied with air in the exemplary embodiment shown here.
  • the oxygen contained in the air serves as an oxidizing agent for the chemical reaction in the interior of the fuel cell 2 and forms together with the Hydrogen in a conventional manner, water, wherein electric power is released, which can be tapped at the fuel cell 2 accordingly.
  • the air for the cathode compartment 4 is compressed accordingly via an air conveyor 9 and fed to the cathode compartment 4.
  • the air conveyor 9 can be designed as a compressor, for example as a screw compressor.
  • the air conveying device 9 should be designed as a flow compressor, which is combined via a shaft with an electric machine 10 and a turbine 11.
  • ETC Electric Turbo Charger
  • the air conveyor 9 can then be operated via the turbine 11 or the operation can be supported at least via the turbine 11. The remaining energy remaining, or if the turbine 11 does not provide energy all the energy for driving the air conveyor 9, can also be provided via the electric machine 10.
  • the electric machine 10 can be operated as well as a generator to convert this resulting mechanical energy into electrical energy, which then in example, a battery of the fuel cell system 1 is stored accordingly or other electrically operated ancillaries can be provided.
  • a water separator 12 In the region of the recirculation line 7, a water separator 12 is also provided, which during operation liquid water, which accumulates in the region of the anode chamber 3 and is discharged via the recirculation line 7, collects. This liquid water can thus not clog gas ducts and the like in the region of the anode compartment 3, so that its safe and reliable operation can be guaranteed.
  • a valve device 13 In the region of the water separator 12, a valve device 13 is provided in the outlet region of the water separator 12, typically in the direction of gravity below, for discharging this water.
  • This valve device 13, which is the core of the one described here Represents system structure, it has a special design, which will be discussed later on comprehensive.
  • a further component 14 is also arranged, which is flowed through by both the supply air flow to the cathode compartment 4 and the exhaust air flow from the cathode compartment 4.
  • This component 14 is intended to be a combined intercooler and humidifier. In principle, it would also be conceivable to design the two components individually one after the other.
  • the task of the component 14 is to cool and humidify the air which is comparatively hot and dry after the air conveying device 9 with the rather cold and moist exhaust air from the cathode chamber 4.
  • the two gas streams flow through the component 14 in separate regions, which are separated from one another by means of partitions which are at least partially permeable to heat and water vapor.
  • the heat of the compressed supply air can be transferred to the exhaust air.
  • moisture present in the exhaust air which is there due to the product water produced primarily in the region of the cathode compartment 4
  • the dry supply air so that it flows into the cathode compartment 4 in a correspondingly humidified manner and thus does not damage the sensitive membranes.
  • the advantage of the structure with the turbine 11 is that used in the component 14 from the supply air flow to the exhaust air flow energy used in the area of the turbine 11 and at least partially made available again for the air conveyor 9 available.
  • the fuel cell system 1 according to FIG. 1 also shows an electronic control system
  • the sensors 16 and 17 should represent corresponding pressure sensors, while the sensor 18 a
  • the control electronics 15 is connected in a conventional manner with the fuel cell 2 itself and can monitor the functionality of the entire fuel cell system 1 and control or regulate. When used in a vehicle, the control electronics 15 is also with a vehicle control unit are in communication in order to implement the corresponding requirements of the vehicle to the fuel cell system 1, for example, by the fuel cell system 1, the power demand imposed by the vehicle accordingly. Thus, the desired propulsion energy can be generated by the Bren ⁇ stoffzellensystem 1, if this provides at least a portion of the drive power for the motor vehicle. In equally conceivable use of the fuel cell system 1 as auxiliary power system, a corresponding request could be made by the electrical auxiliary unit of the vehicle, for example an air conditioning system or a corresponding electronic component.
  • valve device 13 has two flow paths, namely a switchable flow path 19 with a valve element 20 and an overflow path 21, which in the exemplary embodiment shown here is intended to have a fixed predetermined flow-through cross-section via an orifice 22.
  • the switchable flow path 19 and the overflow 21 are guided in parallel in the valve device 13, so that even when the valve 20 is closed, a flow through the overflow 21, which could also be referred to as a bypass, may occur.
  • the water separator 12 is now connected to the region of the supply air to the cathode chamber 4.
  • the water separator After the water separator is correspondingly empty through the Kochströmweg 21, so that the water in it was largely drained, also a part of the gas from the region of the recirculation line 7 is blown over the Kochströmweg 21 of the valve means 13, which also in the supply air reaches the cathode compartment 4.
  • This gas will primarily consist of inert gases, especially nitrogen. In general, however, a small amount of hydrogen will be included. This is mixed in the supply air to the cathode compartment 4 according to the supply air. At the present in the cathode compartment 4 catalysts, the mixture of oxygen and residual hydrogen in the purge gas can then react to water without the exhaust duct from the cathode compartment 4 emissions of hydrogen to the environment would be feared.
  • an opening of the valve 20 in the switchable flow path 19 can be controlled so that it takes place at a time in which the appropriate conditions in the cathode compartment 4, so on the one hand the introduced moisture and on the other hand can be reacted accordingly with introduced residual hydrogen in the purge gas in the cathode chamber 4, without affecting the operation of the fuel cell 2 massively.
  • the hydrogen concentration in the region of the recirculation line 7 can be used. Such can, as exemplified here, be measured in accordance with a hydrogen concentration sensor 18 and processed in the control electronics 15.
  • opening of the valve 20 can also take place if a corresponding amount of water is present in the region of the water separator 12 and the recirculation line 7. Since it is intended to dispense with the typically very sensitive level sensors in the region of the water separator 12, a corresponding deterioration of the fuel cell performance or simply a time-controlled opening of the valve 20 for the drain can then be provided.
  • the orifice 22 is selected with regard to its permeable diameter in accordance with the respective system conditions of the present fuel cell system 1.
  • the flow factor must be chosen so that always the best possible drainage of the water is guaranteed and that in coordination with the volume flow in the recirculation line 7 is also ensured that only a small amount of hydrogen via the overflow 21 from the area of the anode space. 3 and the recirculation line 7 is discharged.
  • a smaller aperture will be used than in a large fuel cell system 1 with larger volume flows through the fuel cell 2.
  • valve device 13 can be realized as shown in FIG. In this case, both a construction with a valve 20 and a bypass line placed around it as Kochströmweg 21 is conceivable.
  • the overflow 21 may also be integrated into the valve 20, for example as a bypass channel in the valve housing.
  • Figures 3 and 4 show possible embodiments of such a valve device 13.
  • the illustration of Figure 3 and Figure 4 shows a valve housing 23, in which by way of example a valve seat 24 and a valve seat 24 corresponding with this valve stem 25 are shown.
  • valve stem 25 can be moved accordingly, so that between the valve stem 25 and the valve seat 24, a flow-through cross section is released.
  • the valve stem 25 can be moved according to magnetic forces, for example, so that a solenoid valve is present.
  • a groove 27 is provided in the valve stem 25 in the valve stem 25, a groove 27 is provided. Through this groove 27 as a recess of the overflow 21 is formed even when the valve 20 is closed, that is, whenever the valve stem 25 - as shown in Figures 3 and 4 - abuts the valve seat 24.
  • the groove 27 can be provided in each case once or several times in the valve lifter 25. Their cross-section defines the flow factor and replaces the aperture 22 shown in FIG. 2.
  • FIG. 4 is essentially analogous to the representation in FIG. 3.
  • a bore 28 is mounted in the valve stem 25.
  • the bore 28 allows a small amount of medium to flow continuously through the valve means 13, even when the valve 20 is closed and the valve stem 25 sealingly abuts the valve seat 24.
  • a plurality of holes 28 can be provided analogously to the example shown above.
  • the structure of the fuel cell system 1 in the embodiment shown here is now comparatively critical with regard to the design of the overflow path 21, since, as already mentioned several times, this must be designed such that no more hydrogen is emitted the area of the recirculation line 7 is lost as absolutely necessary. However, it is the case that different amounts of water and nitrogen in the region of the recirculation line 7 will occur over different operating conditions of the fuel cell system 1. It would therefore be desirable to provide different diameters of the overflow path for different operating conditions. In principle, this would be possible by providing a plurality of overflow paths in parallel, with individual overflow paths being switched on or off correspondingly via corresponding valve devices. However, this would largely consume the advantage of the small number of components and the simple system.
  • the aperture 22 is designed as a flexible aperture.
  • the aperture 22 is exemplified as such a flexible diaphragm.
  • the flexible diaphragm may be formed as an opening 29 in a membrane 30.
  • the membrane 30 itself is neither permeable to water nor to gas, so that the cross section of the overflow 21 is determined by the size of the opening 29. If a corresponding pressure, which is higher than the pressure in the region downstream of the valve device 13, in particular the pressure in the region of the cathode feed, now occurs in the region of the water separator 12, the membrane 30 will correspondingly deform and, for example, the dashed line in FIG Assume position 30 '.
  • the opening then designated 29 'becomes larger, so that the diaphragm 22 in accordance with the pressure difference between the two sides of the diaphragm 22 its corresponding opening cross-section 29, 29' changed accordingly.
  • This is done passively and without a control of the aperture 22 would be necessary for example by means of magnets or the like.
  • the process can be specifically influenced by the pressures in the region of the cathode 4 and the anode 3 are influenced accordingly via the control electronics 15, so that there is a deflection of the membrane 30, 30 'in the region of the flexible diaphragm 22.
  • the flow through the overflow 21 can be adjusted accordingly fine.
  • a larger opening of the flexible diaphragm 22 is desirable.
  • a stabilizing means 31 introduced, for example in the form of a grid or perforated plate become. This stabilizing means 31 can be designed so that the membrane 30 rests with a balanced pressure difference in the region of the stabilizing means 31.
  • the membrane is held in its position by the stabilizing means 31 and can not bulge in the direction of the recirculation line 7 and the water separator 12.
  • the opening 29 remains in its defined opening cross section, although there is a pressure difference between the two sides.
  • the stabilizing means 31 in its arrangement according to FIG. 5 does not disturb the function described above.
  • the opening 29 of the flexible diaphragm 22 is selected so that it opens only when a certain deflection of the diaphragm 30 is realized. This could then be achieved that the valve device 13 in the parked state of the fuel cell system 1, when both sides are depressurized, is closed accordingly, so it does not cause a mixture of gases in the recirculation line 7 and thus in the region of the anode chamber 3 and the gases comes in the region of the cathode compartment 4.
  • FIGS. 3, 4 and 5 are merely examples of possible embodiments for implementation. It is obvious that the person skilled in alternative embodiments are familiar, or can be easily derived by this, which meet the same purpose with a different structural design. It goes without saying that these alternative embodiments are also covered by the invention.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)

Abstract

L'invention concerne un système de piles à combustible (1), comprenant au moins une pile à combustible (2) possédant un espace d'anode (3) et un espace de cathode (4). Il est prévu une conduite de recirculation (7) grâce à laquelle des gaz d'échappement provenant de l'espace d'anode (3) peuvent être renvoyés dans une zone placée devant l'espace d'anode (3). Au niveau de la conduite de recirculation (7) et/ou de l'espace d'anode (3), il est prévu au moins un moyen destiné à extraire des fluides. Selon l'invention, ledit ou lesdits moyens prennent la forme d'un dispositif de vanne (13) qui possède un circuit d'écoulement (19) commutable et un circuit de dérivation (21).
PCT/EP2010/001551 2009-03-24 2010-03-11 Système de piles à combustible avec au moins une pile à combustible WO2010108605A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009014590A DE102009014590A1 (de) 2009-03-24 2009-03-24 Brennstoffzellensystem mit wenigstens einer Brennstoffzelle
DE102009014590.7 2009-03-24

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Publication Number Publication Date
WO2010108605A2 true WO2010108605A2 (fr) 2010-09-30
WO2010108605A3 WO2010108605A3 (fr) 2010-11-18

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WO (1) WO2010108605A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013083223A1 (fr) * 2011-12-08 2013-06-13 Daimler Ag Séparateur de liquide pour système de pile à combustible

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011109644A1 (de) 2011-08-05 2013-02-07 Daimler Ag Brennstoffzellensystem mit wenigstens einer Brennstoffzelle
DE102012020280A1 (de) * 2012-10-17 2013-11-28 Daimler Ag Wasserabscheider für einen Anodenkreislauf
DE102017214723A1 (de) * 2017-08-23 2019-02-28 Audi Ag Strömungskanal und Brennstoffzellensystem

Citations (3)

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