Patent ID: 8141588

Claim:
A plenum system of an apparatus for selective catalytic NO x reduction, said apparatus effective for redirecting fluid flow comprising: a plenum having a first plenum section for carrying a fluid flow in a first flow direction and a second plenum section for carrying the fluid flow in a second flow direction; and an array of parallel, spaced-apart flat blades that are lengthwise transverse to the first flow direction, said array positioned within the plenum at a junction between the first and second plenum sections and configured to redirect the fluid flow from the first direction to the second direction based on being tilted at an oblique angle relative to the first flow direction such that the blades are at an angle of from 15 to 25° relative to the second flow direction and a top portion of each flat blade catches and redirects a portion of the fluid flow from the first direction to the second flow direction; wherein upstream blade edges define a plane positioned diagonally with the plenum to intersect both the first and second flow directions; and wherein the array is adjustable within said plenum and is configured with a blade spacing of about W/30 or less, where W is a width of the second plenum section measured in the first flow direction at an outlet side of the array.