| CPC F01N 3/206 (2013.01) [F01D 25/305 (2013.01)] | 21 Claims |
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1. A method for injecting a reductant into an exhaust duct of a power plant, the method comprising:
flowing the reductant into a first manifold, wherein the first manifold extends from a first end to a second end along a first axis;
flowing the reductant into a second manifold, wherein the second manifold extends from a third end to a fourth end along a second axis;
wherein the first manifold and the second manifold define a boundary having a length defined by lengths of the first manifold and the second manifold and a width defined by a distance between the first manifold and the second manifold;
generating a first mass flow gradient of the reductant along a third axis extending from the first manifold along the width, wherein the first mass flow gradient decreases in a first direction along the third axis;
generating a second mass flow gradient of the reductant along a fourth axis extending from the second manifold along the width, wherein the second mass flow gradient decreases in a second direction along the fourth axis;
wherein the first mass flow gradient along the third axis and the second mass flow gradient along the fourth axis are disposed in a counterflow arrangement;
releasing the reductant of the first mass flow gradient into the exhaust duct;
releasing the reductant of the second mass flow gradient into the exhaust duct; and
combining the reductant of the first mass flow gradient and the second mass flow gradient within the exhaust duct to produce a nearly uniform flow of the reductant within the boundary.
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