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. A plurality of oxidant feed openings (9) are formed in the wall structure (4) on a side facing away from the combustion chamber (2), a plurality of fuel feed openings (10) are formed in the wall structure (4) on the side facing away from the combustion chamber (2), and the oxidant feed openings (9) and fuel feed openings (10) are arranged next to each other and alternating with one another in a straight connection area (11).
Abstract:
A fuel cell system (1) is provided, especially for a motor vehicle, with a fuel cell stack (2), which has a plurality of fuel cell elements (3). The elements (3) are stacked up one upon the other in which an electrolyte separates an anode space from a cathode space. A risk of damage is reduced during heating by a bracing housing (4), which accommodates the fuel cell stack (2) in its interior (5) and which has a pot part (6) and a cover part (7), which are or can be prestressed (with compressive force) towards one another by means of pulling elements (8) and which are supported in the interior (5) by mutually opposite front sides (10) of the fuel cell stack (2).
Abstract:
A reformer system for generating a hydrogen-containing gas for a fuel cell system, especially in a motor vehicle, includes an evaporator arrangement (12) to be fed with hydrocarbon and mixed material for generating a hydrocarbon vapor/mixed material mixture, and a reformer arrangement (14) with reformer catalytic converter material (40, 42) for converting the hydrocarbon vapor/mixed material mixture to hydrogen-containing gas. The reformer arrangement (14) is surrounded by a mixed material flow space (22), through which at least a part of the mixed material to be introduced into the evaporator arrangement (12) can flow for the transmission of heat between the reformer arrangement (14) and the mixed material. An ignition arrangement (52) is assigned to the mixed material flow space (22) for igniting and burning the mixed material flowing through same in the mixed material flow space.
Abstract:
A heating system for a vehicle includes a reformer arrangement for producing hydrogen from a hydrocarbon/mixed material mixture, a burner arrangement for reception of hydrogen produced in the reformer arrangement and combustion thereof, and a heat exchanger arrangement for transferring combustion heat produced in the burner arrangement to a heating medium.
Abstract:
A system (0) includes an electrical load system (54) with a load network battery (82), and a fuel cell system (1). Operation is simplified, especially during start of the fuel cell system (1) if the fuel cell system (1) has a system battery (56). A system voltage across the system battery (56) can be supplied to electrical system loads (80) of the fuel cell system (1) and, via a load voltage converter (77) and at least one additional voltage converter (86), to the load system (54) and secondary electrical loads (84, 85).
Abstract:
A wall structure (21) for a burner (19), with a first wall (40), which has elevations (41) and which defines a first supply chamber (22), and with a second wall (43), which has recesses (44) cooperating with end sections (42) of the elevations (41) and which defines a reaction chamber (20). The first wall (40) has first openings (34), which connect the first supply chamber (23) to the reaction chamber (20). The second wall (43) has second openings (37), which connect a second supply chamber (24) located between the walls (40, 43) to the reaction chamber (20). The first openings (34) are arranged in first rows (35) and the second openings (37) in second rows (38). The mixture formation or homogenization of the gases in the reaction chamber (20) can be improved if at least one second opening (37) is arranged within the first row (35) between two openings (34).
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. The start-up process of the system (1) is improved with an auxiliary burner (20), which reacts air with a fuel into an auxiliary burner waste gas during the operation; with a bypass air line (24), which is connected on the inlet side to the fuel cell air line (12) between the air delivery device (17) and the first heat exchanger (14) and which is connected to the fuel cell air line (12) on the outlet side between the first heat exchanger (14) and the fuel cell (2). A second heat exchanger (23) couples an auxiliary waste gas line (21) removing auxiliary burner waste gas from the auxiliary burner (20) with the bypass air line (24) in a heat-transmitting manner.
Abstract:
A fuel cell system (1) has a fuel cell (2) and a reformer (33). A careful operation of the fuel cell system (1), in particular during a start-up of the fuel cell system (1), is obtained when the fuel cell system (1) is equipped with a reformer heating burner (additional burner) (11). The heat of reformer heating burner waste gas of the reformer heating burner (11) is fed to the reformer (9).
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 wall structure for bordering a combustion chamber of a burner has a top plate that is exposed to the combustion chamber and a bottom plate in contact with the top plate in contact zones on a side facing away from the combustion chamber. The top plate and/or the bottom plate are shaped so that a channel system is created between the top plate and the bottom plate. The top plate contains first openings which communicate with the channel system. In addition, the top plate and the bottom plate have joint second openings in the contact zones communicating with a feed space which is arranged on a side of the bottom plate facing away from the combustion chamber.