Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zum Regeln einer Feuchte eines Kathodengases einer Brennstoffzellenanordnung (1), wobei die Brennstoffzellenanordnung (1) zumindest eine Brennstoffzelle (10) mit einer Kathode (11), eine Kathodengaszuleitung (12) und eine Kathodengasableitung (13) aufweist. Ferner betrifft die Erfindung eine Brennstoffzellenanordnung (1) aufweisend zumindest eine Brennstoffzelle (10) mit einer Kathode (11), eine Kathodengaszuleitung (12), eine Kathodengasableitung (13), einen ersten Drucksensor (20) in der Kathodengaszuleitung (12), einen zweiten Drucksensor (21) in der Kathodengasableitung (13), eine Auswerteeinheit sowie Mittel (14) zum Beeinflussen der Feuchte des Kathodengases.
Abstract:
A system and a method to monitor and control malfunctioning associated with operating parameters of the fuel cell power plant in a vehicle. The system comprises a fuel cell stack to provide power supply to the vehicle. A hydrogen storage system interfaced with a control unit to store and supply hydrogen fuel at predefined state to the fuel cell stack. An air subsystem provides air supply to the fuel cell stack. A thermal management system controls temperature of the fuel cell stack. A control unit monitors and control the hydrogen and air supply, and temperature of the fuel cell stack with in specified limits.
Abstract:
A fuel cell system is provided having at least one fuel cell including an oxidant electrode, a fuel electrode, and an electrolyte membrane interposed between the oxidant electrode and the fuel electrode. The fuel cell system includes a temperature detector which detects a temperature of the fuel cell and a controller which operates the fuel cell, controls a potential of the oxidant electrode, and determines whether to perform a performance recovery operation in which an impurity on the oxidant electrode is oxidized. When the performance recovery operation is to be performed, the controller controls the potential of the oxidant electrode to be a desired potential based on the temperature detected by the temperature detector.
Abstract:
In a gas-to-gas humidifier (10) the active membrane surface area, by way of which waste gas supplied to the gas-to-gas humidifier releases moisture to air to be humidified, is controlled. This is possible in particular continuously by using a slide (24), which covers a portion of the inlets (20) of the passages (16). By the position of the slide (24), the humidity level of the air to be humidified by the gas-to-gas humidifier (10) may be defined. Owing to the use of a slide (24) or another mechanical adjusting element, which directly covers inlets (20) or outlets of passages, the gas-to-gas humidifier (10) is of particularly compact construction and thus takes up only a small amount of space, at the same time being inexpensive.
Abstract:
A method of operating a fuel cell system (10) includes the steps of temporarily supplying a raw fuel to an electrode surface of an anode at the time of starting operation of the fuel cell system (10), supplying water vapor to the electrode surface of the anode at least based on any of the temperature of a fuel cell stack (34) and the temperature of an evaporator (38) after stopping the supply of the raw fuel, and supplying a fuel gas to the electrode surface of the anode by supplying the raw fuel and the water to the evaporator (38) at least based on any of detection results of the pressure of the water supplied to the evaporator (38), the flow rate of the water supplied to the evaporator (38), the pressure of the water vapor discharged from the evaporator (38), and the flow rate of the water vapor discharged from the evaporator (38).
Abstract:
A fuel cell system determines a water blockage or a dry state of the system using voltage sensors that determine anode and cathode voltages of single fuel cells as well as a total voltage for the fuel cell system, and compensate for water blockages or dry states by adjusting supplies of fuel and oxidation gases to the system.
Abstract:
The invention relates to a fuel cell system (1) comprising at least one low-temperature fuel cell (2) having a feed line (5) for an O 2 -containing gas, preferably air, on the cathode side, a discharge line (6) for the exhaust cathode gas, a feed line (7) for a H 2 -containing fuel gas on the anode side, a discharge line (8) for the exhaust anode gas, and a recirculation device (3), on the cathode side, for partially recirculating the exhaust cathode gas to the cathode circuit of the fuel cell (2). In order to improve operation and recirculation possibilities, the recirculation device (3) on the cathode side has a separator (9) for separating the exhaust cathode gas into a liquid water-free gas phase and liquid water, at least one separately adjustable respective recirculation line (10, 11) being provided for every component. A liquid water separator (30, 31) which can be activated and deactivated depending on the operating parameters of the fuel cell system may be arranged in a recirculation line (11, 14) on the cathode side and on the anode side.