Abstract: A burner (1) for burning a gaseous oxidant with a gaseous fuel, with a combustion chamber (2), in which the combustion reaction takes place during the operation of the burner (2), has a wall structure (4) which defines the combustion chamber (2) on the inlet side and which has oxidant openings (5) for introducing the oxidant into the combustion chamber (2) and fuel openings (6), which are separate therefrom, for introducing the fuel into the combustion chamber (2). The wall structure (4) has an oxidant distributor space (7), which is fluidically connected with the oxidant openings (5) on the outlet side and is fluidically connected with at least one oxidant feed opening (9) on the inlet side, as well as contains a fuel distributor space (8), which is fluidically separated from the oxidant distributor space (7) and is fluidically connected on the outlet side with the fuel openings (6) and is fluidically connected with at least one fuel feed opening (10) on the inlet side.

Abstract: A fuel cell system (1), especially in a motor vehicle, is provided with a fuel cell (2), which generates electric current during the operation from anode gas and cathode gas, with a residual gas burner (3), which reacts anode waste gas with cathode waste gas into burner waste gas during the operation; with an air delivery device (17), which feeds air as cathode gas to the fuel cell (2) via a fuel cell air line (12) during the operation; and with a first heat exchanger (14), which couples a waste gas line (13) removing burner waste gas from the residual gas burner (3) with the fuel cell air line (12) in a heat-transmitting operation.

Abstract: A burner (1) for burning a gaseous oxidant with a gaseous fuel, with a combustion chamber (2), in which the combustion reaction takes place during the operation of the burner (2), has a wall structure (4) which defines the combustion chamber (2) on the inlet side and which has oxidant openings (5) for introducing the oxidant into the combustion chamber (2) and fuel openings (6), which are separate therefrom, for introducing the fuel into the combustion chamber (2). The wall structure (4) has an oxidant distributor space (7), which is fluidically connected with the oxidant openings (5) on the outlet side and is fluidically connected with at least one oxidant feed opening (9) on the inlet side, as well as contains a fuel distributor space (8), which is fluidically separated from the oxidant distributor space (7) and is fluidically connected on the outlet side with the fuel openings (6) and is fluidically connected with at least one fuel feed opening (10) on the inlet side.

Abstract: A process for starting up a fuel cell system (1) is provided wherein the fuel cell system (1) has a fuel cell (2), a reformer (33) and an auxiliary burner (20). The fuel cell air is preheated with the auxiliary burner (20) and fed to a cathode side (8) of the fuel cell (2). Residual gas is circulated from an anode side (6) of the fuel cell (2) to the reformer (33) and from the reformer (33) to the anode side (6).

Abstract: A modular fuel cell system (1) is provided, especially for use in vehicles, with a fuel cell module (2), which has a stack (7) of a plurality fuel cell elements (6) between a first end plate (4) and a second end plate (5), with a burner-heat exchanger module (3), which has a heat exchanger (10) for preheating cathode gas and a burner (11) for reacting fuel cell waste gases.