Integrated mixing system for exhaust aftertreatment system

An exhaust gas treatment system configured to receive exhaust gas from an internal combustion engine, the system comprising:

• a catalyst device;
• and
• a swirl can mixer assembly for mixing a fluid with the exhaust gas, the swirl can mixer assembly comprising:
• an inlet portion including an injection area;
• a fluid injector coupled to the inlet portion and configured to dispense the fluid into the exhaust gas in the injection area for mixing with the exhaust gas in the mixing assembly to produce an exhaust gas/fluid mixture;
• an outlet portion coupled to the catalyst device;
• and
• an extended mixing conduit fluidly coupled between the inlet portion and the outlet portion, wherein the extended mixing conduit is curved about at least a portion of a circumference of the outlet portion to induce a swirl in the exhaust gas/fluid mixture such that the exhaust gas/fluid mixture enters the outlet portion tangentially thereto.