DEVICE FOR SUBSEQUENTLY TREATING EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE

摘要

The invention relates to a device for subsequently treating exhaust gases of an internal combustion engine while using a reducing agent, especially a urea or a urea-water solution, that is fed into the exhaust gases. The inventive device comprises a mixing chamber (8). In order to produce a reducing agent-air mixture, a reducing agent stored in a reducing agent reservoir (1) can be fed into said mixing chamber via a reducing agent line (12), and compressed air contained in a compressed air reservoir (20) can be fed into the mixing chamber via a compressed air line (24). The inventive device also comprises means (23) for preventing a reverse flow of reducing agent or reducing agent-air mixture from the mixing chamber (8) into the compressed air line (24).