Fuel cell system

Gaseous fuel and, if required, steam and/or oxygen are fed in through a first flow channel (11a) connected to a fuel tank and a vaporizer. Fuel feeds through a first hole (12a) into a gas-generating device (2), and hydrogenous gas is fed into a second flow channel (11b) via a delivery mechanism and a second hole (12b). Two or more sub-units in the fuel cell system can interlink mechanically and fluidically by using a connecting plate.