METHOD AND DEVICE FOR POST-TREATMENT OF EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE

摘要

The invention relates to a method and device for post-treating the exhaust gases of an internal combustion engine. The inventive device comprises a body (4) through which exhaust gases flow and which is rotatably placed in the flow of said exhaust gases, as well as a filter (6) which can rotate with said body (4). The rotation speed of the body (4) is selected so that a major part of the temperature front which forms in the body remains in said body. Preferably, said body is in the form of a cylinder with an axial cavity (7) which houses the filter (6) and through which channels (3) extend in the radial direction (3). The rotation axis of said cylinder is perpendicular to the direction of flow of the exhaust gases. When the body is in the form of a NOx accumulating catalyst, removal of nitric oxide can be achieved by cyclic enrichment of the exhaust gases or by introduction of extra fuel in the inventive device. Thus, desulfurization of the catalyst is triggered by a corresponding command of rotation of said catalyst.