摘要:
A fuel cell system configured to generate power by supplying anode gas and cathode gas to a fuel cell includes a cathode gas supply unit configured to supply the cathode gas to the fuel cell, a cathode pressure detection unit configured to detect a pressure of the cathode gas to be supplied to the fuel cell, a fuel cell temperature detection unit configured to detect a temperature of the fuel cell, an internal resistance detection unit configured to detect an internal resistance of the fuel cell, a target cathode flow rate calculation unit configured to calculate a target cathode flow rate necessary for supply to the fuel cell based on an operating state of the fuel cell system, a cathode flow rate estimation unit configured to estimate a flow rate of the cathode gas according to the pressure of the cathode gas, the temperature of the fuel cell and the internal resistance of the fuel cell, and a cathode flow rate control unit configured to control the cathode gas supply unit based on the target cathode flow rate and the estimated flow rate of the cathode gas.
摘要:
A hydrogen generating apparatus (200) includes an electrolyzer (210), which is filled with an aqueous electrolyte solution (215), a first electrode (220), which is accommodated in the electrolyzer (210), submerged in the aqueous electrolyte solution (215), and generates electrons, a second electrode (230), which is accommodated in the electrolyzer (210), submerged in the aqueous electrolyte solution (215), receives the electrons to generate hydrogen, and a controller (240), which is located between the first electrode (220) and the second electrode (230) and controls an amount of electrons flowing from the first electrode (220) to the second electrode (230) for a period of time. The present invention differs from the conventional method of generating hydrogen by a certain quantity, in that the quantity of generated hydrogen can be controlled by controlling the amount of current flowing between electrodes according to a user or a fuel cell.
摘要:
The present invention restores the performance of a fuel cell by: operating the cell in a loaded current mode different from that of a normal operation for a predetermined time; supplying an oxidant gas and a fuel gas to an anode and a cathode respectively and outputting a current from a cell body with the polarity being inverted; supplying a pressurized gas to at least one of the cathode and anode in an amount not less than 1.5 times as much as that in the normal operation or supplying oxygen to the cathode; or injecting a cleaning solution into the cathode and anode through a gas flow path. Consequently, it is possible to effectively restore a degraded performance of a polymer electrolyte fuel cell caused by a long operation.
摘要:
The present invention restores the performance of a fuel cell by: operating the cell in a loaded current mode different from that of a normal operation for a predetermined time; supplying an oxidant gas and a fuel gas to an anode and a cathode respectively and outputting a current from a cell body with the polarity being inverted; supplying a pressurized gas to at least one of the cathode and anode in an amount not less than 1.5 times as much as that in the normal operation or supplying oxygen to the cathode; or injecting a cleaning solution into the cathode and anode through a gas flow path. Consequently, it is possible to effectively restore a degraded performance of a polymer electrolyte fuel cell caused by a long operation.
摘要:
In einem Verfahren zur Regelung eines Brennstoffzellenstapels (1) wird eine Strom-Spannungskennlinie des Brennstoffzellenstapels erfasst und ausgewertet, um einen Betriebspunkt des Brennstoffzellenstapels zu bestimmen, wobei im Betrieb in zeitlichen Abständen eine Strom-Spannungskennlinie des Brennstoffzellenstapels (1) erfasst wird, deren Steigung ein Minimum hat, jeweils aus der erfassten Strom-Spannungskennlinie ein charakteristischer Wert (R min ) für das Minimum der Steigung ermittelt wird und durch Addition eines vorbestimmten Offsetwertes (R offset ) zum charakteristischen Wert ein Sollwert für den Betriebspunkt bestimmt wird, und wobei der Brennstoffzellenstapel (1) mit dem derart bestimmten Sollwert geregelt wird.
摘要:
In a fuel cell system including a stack of polymer electrolyte fuel cells, the wet state of electrolyte membranes in the fuel cell stack is detected according to a variation in measurement value of an alternating current impedance (AC impedance) of the fuel cell stack. In an adequate level of water content of the electrolyte membranes, the measurement value of the AC impedance is substantially constant and has a very little variation. In an excess level of water content of the electrolyte membranes, the measurement value of the AC impedance has a significant variation. The AC impedance of the fuel cell stack is determinable by frequency analysis of high-frequency noise generated by an inverter included in the fuel cell system.
摘要:
A process for improved performance in a fuel cell or stack of fuel cells wherein the fuel cell has a cathode, an anode, an anode chamber, a cathode chamber, a fuel comprising an anolyte that flows through an inlet (14), the cell and an outlet (15), and a catholyte gas, wwherein each electrode comprises a catalyst (12) and a gas diffusion backing (13), and wherein the fuel cell is connected to an external load, which process comprises taking the load off the cell, and cycling between a minimum voltage and about 50% of the maximum voltage drawn from the fuel cell until a maximum current is reached, or a minimum load and about 50% of the maximum load until a maximum voltage is reached. Fuel cell performance is further enhanced by purging.
摘要:
The present invention restores the performance of a fuel cell by: operating the cell in a loaded current mode different from that of a normal operation for a predetermined time; supplying an oxidant gas and a fuel gas to an anode and a cathode respectively and outputting a current from a cell body with the polarity being inverted; supplying a pressurized gas to at least one of the cathode and anode in an amount not less than 1.5 times as much as that in the normal operation or supplying oxygen to the cathode; or injecting a cleaning solution into the cathode and anode through a gas flow path. Consequently, it is possible to effectively restore a degraded performance of a polymer electrolyte fuel cell caused by a long operation.