Open- Loop Mode
Sea water is used to scrubber to spray the exhaust gas and remove SOx. After passing the scrubber, the water is treated by sea water to meet the MEPC 184(59) discharged criteria, then discharge into the sea.
Exhaust gas enters the scrubber from the bottom to the top of scrubber and is sprayed with sea water by four lays of spray nozzles, the sulphur oxide in the exhaust reacts with sea water and forms sulphuric acid. Chemicals are not required normally as the natural alkalinity of sea water neutralizes the acid. However, NaOH system will be designed while the vessel sail on the low acid water or fresh water to exempt seaman to change the fuel oil frequently.