Patent ID: 7481982

Claim:
A carbon monoxide oxidizer, comprising: a mixing unit that mixes at least two kinds of gases as a mixed gas, the mixing unit comprising a stacked body of a plurality of plates, the stacked body comprising a rotating passage formed by a through hole formed in each of the plates, to rotate a flow of the mixed gas wherein the at least two kinds of gases comprise a reformate gas that comprises hydrogen produced by reforming a hydrocarbon fuel, and an oxidant gas, and wherein the carbon monoxide oxidizer further comprises an oxidant gas supply unit comprising an orifice that reduces a cross-sectional area of a flow of the reformate gas and a blowout hole spurting out the oxidant gas toward the reformate gas passing through the orifice, and the mixing unit further comprises a chamber between the oxidant supply unit and the stacked body, the chamber having a larger cross-sectional area than the cross-sectional area of the orifice.