Patent ID: 8580443

Claim:
An arrangement for controlling an oxygen to carbon relationship in a fuel cell system for producing electricity with a fuel cell having an anode side, a cathode side and an electrolyte between the anode side and the cathode side, wherein the fuel cell system includes a feed for gas used as fuel to the anode side, a water supply, at least one water pump for pumping water to facilitate a water flow, and an evaporator for evaporating water from a facilitated water flow for generating pressurized steam, wherein the arrangement for controlling the oxygen to carbon relationship comprises: means for condensing at least part of a water vapour fraction of anode exhaust gas into the water supply for the arrangement; a feedback arrangement for recirculating part of an anode side gas as a substantially dry gas obtained from the means for condensing; and at least one steam jet-ejector connected to inject at least part of a pressurized steam flow to a fuel cell system, and entrain at least a part of the substantially dry gas in an anode side gas recirculation and compress a gas mixture to a pressure of a fuel feed-in stream for controlling the oxygen to carbon relationship in a fuel side of the fuel cell system.