METHOD AND DEVICE FOR THE PURIFICATION OF EXHAUST GASES
The invention relates to a method for the purification of exhaust gases that contain combustible and NOx-containing exhaust gas components, especially gases originating from lean-mix internal combustion engines, in an exhaust gas converter (1) that comprises at least one heat exchanger (12) with catalysts (15, 33) arranged in the inflow (6) and/or outflow channels (7) thereof. According to the inventive method, exhaust gas (2) flowing into the device is heated up in heat exchange with outflowing exhaust gas and heat is supplied to the exhaust gas. The incoming exhaust gas (2) enters, without deflection and danger of congestion caused by flow obstacles, the inflow channels (6) of the heat exchanger (12) and flows through these channels until it reaches a deflection area (9). Heat in the form of burner exhaust gas is supplied to the exhaust gas by means of an electrically heated burner (19) that is disposed in the deflection area (9) and that is provided with at least one catalyst (31, 32). The burner exhaust gas is admixed to the gas issued from the inflow channels (6), enters the outflow channels (7) together with said gas and is purified from nitrogen oxides by means of a denitrification catalyst (33).