Dual Auger Mixing System

A mixing system for an exhaust aftertreatment system, the mixing system disposed within an exhaust pipe and comprising:

• a first mixing device including a plurality of first auger blades defining a plurality of flow paths through the first mixing device, the first mixing device further including a longitudinal centerline and an inlet having a first cross-sectional area;
• a second mixing device separate and distinct from the first mixing device and disposed downstream of the first mixing device, the second mixing device including a longitudinal centerline, an inlet having a second cross-sectional area greater than the first cross-sectional area and a second auger blade, the plurality of flow paths created by the first mixing device recombining into a single flow path between the first and second mixing devices;
• and
• a baffle plate separate and distinct from the second mixing device and disposed downstream of the second mixing device, the longitudinal centerline of the first mixing device being offset from the longitudinal centerline of the second mixing device.