DOSING AND MIXING ARRANGEMENT FOR USE IN EXHAUST AFTERTREATMENT

摘要

A dosing and mixing arrangement including an exhaust conduit defining a central axis; a mixing conduit positioned within the exhaust conduit; a dispersing arrangement (e.g., a mesh) disposed at the upstream end of the mixing conduit; an injector coupled to the exhaust conduit and configured to direct reactants into the exhaust conduit towards the mesh; and an annular bypass defined between the mixing conduit and the exhaust conduit for allowing exhaust to bypass the upstream end of the mixing conduit and to enter the mixing conduit downstream of the mesh.

主权项

1. A dosing and mixing arrangement comprising:
an exhaust conduit defining a flow path; an inner conduit positioned within the exhaust conduit, the inner conduit extending along the flow path from an upstream end face to a downstream end face, the inner conduit defining an interior that is devoid of structure in longitudinal alignment with the upstream end face of the inner conduit; a bypass region disposed radially between the inner conduit and the exhaust conduit; and a disperser for dispersing reactants, the disperser including a first region and a second region that is less restrictive than the first region, the first region of the disperser extending across the upstream end face of the inner conduit, and the second region of the disperser at least partially restricting access to the bypass region.