Patent ID: 9689290
Date: 2017-06-27
CPC Classifications: B01F,F01N,Y02A,Y02T

Claim:
1. An after-treatment (AT) system for a flow of exhaust gas from an internal combustion engine, the AT system comprising: a first AT device; a second AT device in fluid communication with and positioned in the flow of exhaust gas downstream of the first AT device; an exhaust passage configured to carry the flow of exhaust gas from the first AT device to the second AT device; an injector configured to introduce a reductant into the exhaust passage; and a mixer positioned within the exhaust passage downstream of the injector and configured to mix the reductant with the flow of exhaust gas; wherein: the second AT device includes an inlet cone having a volute defining a spiral primary path for the flow of exhaust gas into the second AT device and configured to generate a swirling motion of and turbulence in the flow of exhaust gas; the exhaust passage includes an L-bend; the mixer is positioned in a plane square to the flow of exhaust gas within the exhaust passage; and the injector is positioned upstream of the L-bend such that the reductant is introduced along the flow of the exhaust gas and at an angle of 40-90 degrees with respect to the plane of the mixer.