Exhaust gas treatment system and exhaust gas treatment method, ship equipped with exhaust gas treatment system, and use of exhaust gas treatment system

摘要

A system and method for treating engine exhaust gas (EEG) from an engine (3) is provided, the engine exhaust gas (EEG) having a temperature between T1 and T2. Also provided are ships including the system and use of the system. The system (1) includes an SCR reactor (9) for converting NOx contained in a medium (M) containing engine exhaust gas (EEG) into N2 and H2O. The SCR reactor (9) has an inlet (33) for receiving the medium (M) and an outlet (35) for outputting the medium in which NOx is reduced (M-NOx). . The system (1) is further characterized in that it comprises a mixing unit (7) and a first boiler unit (5). The first boiler unit (5) has a first outlet (19) for outputting boiler exhaust gas (BEG) from the first boiler unit (5), and the boiler exhaust gas (BEG) is T3. It has a higher temperature than (T3 T1). The mixing unit (7) is configured to mix engine exhaust gas (EEG) with boiler exhaust gas (BEG) to generate a medium (M). The mixing unit (7) has a first inlet (27) communicating with the engine (3) for receiving engine exhaust gas (EEG), and a first boiler unit for receiving boiler exhaust gas (BEG). A second inlet (29) communicating with the first outlet (19) of (5) and an outlet (31) for outputting the medium (M) are provided. The outlet (31) of the mixing unit (7) communicates with the inlet (33) of the SCR reactor (9).