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
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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
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.
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;
- 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;
- an interior of the mixing conduit being devoid of structure in longitudinal alignment with an upstream face of the disperser;
- wherein the mixing conduit defines a plurality of apertures therethrough at a location downstream of the disperser, the apertures being configured to allow exhaust to bypass the upstream end of the mixing conduit, the plurality of apertures including a first set of apertures at a first axial location along the mixing conduit and a second set of apertures at a second axial location downstream of the first axial location, the first set of apertures extending around less than a circumference of the mixing conduit, and the second set of apertures extending around the circumference of the mixing conduit.
Dependencies are inferred from the claim text.