Exhaust system for e.g. commercial vehicles with selective catalytic reduction of hydrocarbons and particle filtration, has tail pipe with air cooling

摘要

Inside the tail pipe (10) a concentric admixing tube (11) supplies cooling air to exhaust gases. The admixing tube internal diameter is ca. 30% of the tail pipe internal diameter. The spacing of the end of the admixing tube (12) from the end of the tail pipe (13) is ca. 50-100% of the internal diameter of the tail pipe.