Patent ID: 8672643

Claim:
A fuel cell system including a multistage ejector for anode gas recirculation in the fuel cell system, comprising the multistage ejector comprising: a) a multistage ejector body forming a fluid flow path and containing a common mixing chamber and a common diffuser; b) the multistage ejector body including a main central nozzle body including a first fresh anode gas inlet port and a main nozzle outlet wherein the main nozzle outlet is situated along the central axis of the multistage ejector body; c) the multistage ejector body further including a peripheral nozzle body including a second fresh anode gas inlet port and peripheral nozzle outlets being one of, aligned with, or arranged at a slight angle to the main nozzle outlet; d) wherein the common mixing chamber is formed in the common diffuser and the common diffuser is fluidically connected to the common mixing chamber for mixing fresh anode gas ejected from the main nozzle outlet and peripheral nozzle outlets with recirculating anode gas exiting a fuel cell stack.