Method, apparatus and device for improved aftertreatment of exhaust gas

A mixing device 260 for aftertreatment of an exhaust gas. The mixing device comprises a housing 261 defining an inner cavity 262, an exhaust inlet 252 into the inner cavity, an exhaust outlet 290 from the mixing device, and a double funnel-shaped tubular flow guide 263 in the inner cavity. The flow guide has first and second funnel-shaped portions 301, 302 connected at their smaller diameters, the first portion defining an inlet 264 of the flow guide, and the second portion defining an outlet 265 of the flow guide. The flow guide forms a swirling flow of exhaust gas around the flow guide within the inner cavity. A slot 266 between the inlet of the flow guide and a first end wall 267 of the inner cavity allows the swirling flow to enter the flow guide, and flow there through to the outlet thereof. The mixer unit may be provided downstream of a diesel particulate filter (DPF) and a mixer unit which dispenses a reducing agent (such as urea or ammonia), and upstream of a selective catalytic ...

Method, apparatus and device for improved aftertreatment of exhaust gas