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 central axis; a mixing conduit positioned within the exhaust conduit, the mixing conduit extending along the central axis from an upstream end to a downstream end; a disperser for dispersing reactants disposed at the upstream end of the mixing conduit, the disperser including a first region and a second region that is less restrictive than the first region, the first region extending across the upstream end of the mixing conduit; and a bypass for allowing exhaust to bypass the upstream end of the mixing conduit and to enter the mixing conduit downstream of the disperser, the second region of the disperser at least partially restricting access to the bypass; an interior of the mixing conduit being devoid of structure in longitudinal alignment with an upstream face of the disperser.