Efficient mixing of gases in an exhaust aftertreatment system
AssigneeCNH Industrial America LLC
InventorsDaniel A. Morey, Nikolay B. Popov
Life of this patent
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Abstract
An inlet for an SCR device including a tube having an upstream end for receiving exhaust gases and a downstream end terminating in a porous wall. A plurality of openings are spaced around the circumference of the tube adjacent the porous wall and a plurality of vanes are formed at a connection junction adjacent one edge of the opening to form vanes extending inward at an acute angle relative to a plane between the connecting junction and the longitudinal axis of the tube. Preferably, the vanes are concave on the surface extending inward to promote more effective mixing.
Claims17
An inlet for exhaust gases to a selective catalytic reduction (SCR) device having a housing for flow through of exhaust gases, said inlet comprising:
- a tube having a longitudinal axis and an open upstream end receiving exhaust gases and a downstream end terminating in a porous wall;
- said tube having a plurality of openings spaced around the circumference of said tube adjacent to said porous wall;
- and,
- vanes, each vane extending from a respective connecting junction on said tube inwardly at an acute angle relative to a reference plane intersecting said respective connecting junction and the longitudinal axis of said tube, wherein a longitudinal axis of each connecting junction is substantially parallel to the longitudinal axis of said tube, and wherein said vanes have a concave surface facing radially inward.
An exhaust aftertreatment system comprising:
- a housing for a selective catalytic reduction (SCR) device, said housing having a generally cylindrical or oval cross section shape with a longitudinal axis;
- a plurality of catalyst housed therein over which the exhaust flows through said housing;
- an inlet comprising a tube having a longitudinal axis and an open upstream end for receiving exhaust gases and a downstream end extending into said housing and terminating in a porous wall, said tube having a plurality of openings spaced around the circumference of said tube adjacent to said porous wall and
- vanes, each vane extending from a respective connecting junction on said tube inwardly at an acute angle relative to a reference plane intersecting said connecting junction and the longitudinal axis of said tube, wherein a longitudinal axis of each connecting junction is substantially parallel to the longitudinal axis of said tube.
An inlet for exhaust gases to a selective catalytic reduction (SCR) device having a housing for flow through of exhaust gases, said inlet comprising:
- a tube having a longitudinal axis and an open upstream end receiving exhaust gases and a downstream end terminating in a porous wall, wherein said porous wall is formed from a plurality of circular openings;
- said tube having a plurality of openings spaced around the circumference of said tube adjacent to said porous wall;
- and
- vanes, each vane extending from a respective connecting junction on said tube inwardly at an acute angle relative to a reference plane intersecting said respective connecting junction and the longitudinal axis of said tube wherein a longitudinal axis of each connecting junction is substantially parallel to the longitudinal axis of said tube.
Dependencies are inferred from the claim text.