Dosing and mixing arrangement for use in exhaust aftertreatment
AssigneeDonaldson Company, Inc.
InventorsMark Thomas Brandl, Bruce Hoppenstedt, Stephen Ronald Schiller, Matthew S. Whitten
Life of this patent
Estimating the term…
Abstract
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.
Claims20
An exhaust treatment system comprising:
- an exhaust conduit defining an inner circumferential surface having a first internal diameter;
- a first mixing arrangement defining a first mixing region disposed within the exhaust conduit and at which exhaust is swirled in a first swirl direction;
- a second mixing arrangement defining a second mixing region disposed within the exhaust conduit and at which exhaust is swirled in a second swirl direction that is opposite the first swirl direction, the second mixing region being disposed downstream from the first mixing region;
- a restrictor disposed within the exhaust conduit and contacting the inner circumferential surface of the exhaust conduit at a contact location downstream of the second mixing region, the restrictor separating the exhaust conduit into a first section upstream of the contact location and a second section downstream of the contact location, the restrictor providing a restricted flow path between the first and second sections of the exhaust conduit, the restricted flow path having a second internal diameter at an entrance to the restricted flow path that is smaller than the first internal diameter;
- and
- a doser mounting location disposed along the exhaust conduit, the doser mounting location being configured to receive a doser.
Dependencies are inferred from the claim text.