EXHAUST AFTERTREATMENT SYSTEM WITH SILENCER FOR MID-BED AIR INJECTION MIXING

摘要

A system includes an exhaust aftertreatment system (10) configured to treat emissions from a combustion engine (12). The exhaust aftertreatment system (10) includes a first catalyst assembly (22) having an outlet (28). The exhaust aftertreatment system (10) also includes an ammonia slip catalyst (ASC) assembly (24) configured to receive a fluid (30) from the first catalyst assembly (22) and to convert ammonia (NH3) within the fluid into nitrogen (N2), wherein the ASC assembly (24) has an inlet (38). The exhaust aftertreatment system further includes a silencer (13) disposed between the outlet (38) of the first catalyst assembly (22) and the inlet (38) of the ASC assembly (24), wherein the silencer (13) is configured to receive the fluid (30) and an oxidant for mixing with the fluid (30) provide sufficient oxygen in the fluid (30) flowing into the inlet (38) of the ASC assembly (24) to enable the catalytic activity in the ASC assembly (24) that coverts NH3 into N2, and the silencer (13) is configured to mix the fluid (30) and the oxidant.