METHOD AND SYSTEM FOR INTRODUCING A REDUCING AGENT INTO EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE

摘要

The present invention relates to an exhaust gas system (10) for an internal combustion engine (2), comprising a selective catalytic reduction (SCR) purification system (34) which comprises an injection arrangement (28) for adding a reducing agent (30) to a flow of exhaust gases (22) and an essentially circular cylindrical vaporisation chamber (41) comprising an inlet end (48) and an outlet end (49). The vaporisation chamber (41) is arranged in fluid connection with a swirl-generating means (60) that provides swirl-motion to the exhaust gas flow (22) and the reducing agent inside the vaporisation chamber (41). The outlet end (50) of the vaporisation chamber (41) is arranged in fluid connection with a swirl-retarding means (70) arranged to retard the swirl-motion of the exhaust gas flow (22) and the reducing agent inside the vaporisation chamber (41).