COMBINED CLEANING SYSTEM AND METHOD FOR REDUCTION OF SOX AND NOX IN EXHAUST GASES FROM A COMBUSTION ENGINE

摘要

The present invention relates to a combined purification system to be used in a wet scrubber process for the reduction of SO _x and NO _x in the exhaust gas from the combustion engine (2). The system includes an Exhaust Gas Cleaning (EGC) scrubber 1 and an Exhaust Gas Recirculation (EGR) scrubber 11. The combined purifying system is operated in the EGR scrubber process loop 13 between the scrubber water circulation tank 15 and the EGC scrubber 1 and in the EGR scrubber process 13 between the scrubber water circulation tank 15 and the EGR scrubber 11 And a scrubber water circulation tank (15) arranged to circulate in the loop (14). The EGR scrubber process loop 14 includes an arrangement 39 for supplying a first alkaline agent to the flow of scrubber water and a first separator unit 29 for separating particulate matter from the circulated scrubber water. The invention also relates to a method for reducing SO _x and NO _x in the exhaust gas from the combustion engine (2) by using a combined wet scrubber purifying system. Additionally, the present invention relates to the use of said combined purification system on board.