Patent ID: 7416799

Claim:
An oxidizer usable with a fuel cell, comprising: a catalyst; an inlet to communicate an oxidant flow; an injection tube coaxial with a longitudinal axis and located in the inlet to communicate an anode exhaust flow from the fuel cell into the oxidizer such that the anode exhaust flow exits the injection tube at an outlet of the injection tube, wherein the oxidant flow comprises an annular flow that is substantially parallel to the longitudinal axis both upstream of the outlet and downstream of the outlet to produce a combined flow in which the anode exhaust flow is oriented in substantially the same direction as the oxidant flow and surrounded by the oxidant flow; a mixing tube connected to the inlet to receive the combined flow and mix the oxidant flow and the anode exhaust flow mix together to produce a mixed flow, a cross-sectional flow area of the mixing tube being sized to prevent flashback; and a divergent nozzle to communicate the mixed flow to the catalyst.