Aftertreatment system including mixer with exhaust sampling flange

A mixer for an aftertreatment system, the mixer comprising:

• a mixer body centered on a mixer body center axis and configured to receive exhaust and a hydrocarbon fluid, the mixer body comprising:
• an upstream end,
• a downstream end, and
• a first aperture between the upstream end and the downstream end;
• an injector plate coupled to the mixer body adjacent to the first aperture;
• an exhaust sampling flange coupled to the mixer body between the first aperture and the downstream end, the exhaust sampling flange comprising exhaust sampling flange apertures arranged circumferentially around the mixer body center axis, wherein the injector plate is offset from a first of the exhaust sampling flange apertures along the mixer body center axis;
• an outlet flange coupled to the downstream end at a location downstream of the exhaust sampling flange;
• and
• an outlet tube coupled to the outlet flange and in fluid communication with at least one of the exhaust sampling flange apertures, wherein the outlet flange comprises an opening configured to facilitate a flow of the exhaust between one of the exhaust sampling flange apertures and the outlet tube.

An aftertreatment system comprising:

• an introduction conduit;
• and
• a mixer disposed within the introduction conduit, the mixer comprising:
• a mixer body centered on a mixer body center axis and configured to receive exhaust and a hydrocarbon fluid, the mixer body having a first end and a second end downstream of the first end,
• an exhaust sampling flange coupled to the mixer body at a location between the first end and the second end, the exhaust sampling flange comprising:
• exhaust sampling flange apertures arranged in an array that extends circumferentially around the mixer body center axis,
• a louver adjacent to a first of the exhaust sampling flange apertures, the louver angled away from the exhaust sampling flange and extending over at least a portion of the first exhaust sampling flange aperture in a rotational direction around the mixer body center axis, and
• an outlet flange coupled to the second end at a location downstream of the exhaust sampling flange, the outlet flange comprising an outlet flange aperture configured to facilitate flow of the exhaust from inside the mixer body.