Wärtsilä Closed Loop Scrubber
A cost effective alternative to low sulphur content fuels for reducing SOx emissions
The system operates in a closed loop, i.e. the wash water is being circulated within the scrubber. Exhaust gas enters the scrubber and is sprayed with fresh water that has been mixed with caustic soda (NaOH). The sulphur oxides in the exhaust react with this mixture and are thereby neutralised.
A small bleed-off is extracted from the closed loop and treated tofulfill requirements stipulated by the IMO. Cleaned effluents can be safely discharged overboard with no harm to the environment.
If operation in zero discharge mode is requested, the effluent can be led to a holding tank for scheduled and periodical discharge.
The agreement made with Containerships Ltd Oy covers the retrofitting of a Wärtsilä fresh water scrubber system in 2011 for the company’s Containership VII vessel, which is equipped with a Wärtsilä 7L64 main engine. »