Exhaust aftertreatment system for internal combustion engine

摘要

A mixing plenum for exhaust gas comprises a canister with an inlet and an outlet. A bulkhead is located downstream from the inlet to define an exhaust gas consolidation chamber. An opening in the bulkhead allows exhaust gas to enter a u-shape conduit configured to direct the exhaust gas from a downstream direction to an upstream direction before releasing the exhaust gas back into the plenum downstream of the bulkhead. An injector is configured to inject fluid into the exhaust gas entering the conduit. A conduit exit located a distance “E” from the downstream side of the bulkhead allows the exhaust gas/fluid mixture to exit the conduit into a larger exit volume of the compact mixing can, in the manner of an expansion chamber, where its velocity slows and further mixing of the fluid/exhaust gas occurs and exits the compact mixing can through the outlet flange.

主权项

1. An exhaust gas treatment system having a compact mixing plenum configured to receive an exhaust gas/fluid mixture comprising:
a canister having an upstream inlet; a bulkhead disposed within said canister at a distance downstream of said upstream inlet to thereby define an exhaust gas consolidation chamber therebetween; an exhaust gas opening, disposed in said bulkhead, through which exhaust gas passing through said exhaust gas consolidation chamber enters a high pressure, high velocity mixing conduit, said mixing conduit comprising:
a substantially U-shaped conduit configured to direct the fluid/exhaust gas mixture from a downstream to an upstream direction within the compact mixing plenum for through mixing of said fluid/exhaust gas mixture; anda high pressure, high velocity mixing conduit exit located adjacent a downstream side of the bulkhead, anda low pressure, low velocity exit volume defined by said rigid canister downstream of said bulkhead and configured to receive the fluid/exhaust gas mixture from said high pressure, high velocity mixing conduit exit for further mixing of said fluid/exhaust gas mixture wherein actual exhaust flow distance is realized over line-of-sight flow distance.