Importance

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Abstract

A fuel cell system has at least one fuel cell which includes an anode compartment and a cathode compartment, and a recirculation line for anode gas which leads from a gas outlet of the anode compartment to a gas inlet of the anode compartment and in which an ejector pump is arranged. The ejector pump includes a first nozzle and at least one second nozzle which is in the form of a ring nozzle arranged coaxially around the first nozzle. A respective fuel gas valve is associated with a respective nozzle and controls a supply of pressurized fuel gas to a primary gas inlet of the respective nozzle. In a low load range, only the first or only the at least one second nozzle of the ejector pump is selectively supplied with primary gas, whereas in a high load range both nozzles are supplied with primary gas simultaneously.

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First Claim