Containerships VII
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.
Working principle
The Wärtsilä scrubber works with fresh water boosted by NaOH to create a strong alkaline solution. As a result of the chemical process, SOX emissions, are neutralised to sulphates in the scrubbing water. A small amount of bleed-off, extracted from the scrubbing water, is cleaned in the bleed-off treatment unit. Clean effluent, fulfilling all the quality and monitoring requirements stipulated by the IMO, can then be discharged to the sea. The process is monitored constantly. In so-called zero discharge mode, the effluent is led to a buffer tank for periodical discharge. Contaminants removed in the bleed-off treatment unit are always disposed of at the appropriate reception facilities in port.
Containerships VII solution
Onboard the Containerships VII, fresh water is produced using a fresh water generator. NaOH is stored in the existing heavy fuel oil tank, which will be modified for NaOH storage purposes. The tank will be coated internally, and heating will be arranged in order to keep the temperature between 25 - 35°C which is the recommended storage temperature. The alkali feed unit, located close to the NaOH storage tank, automatically monitors the pH value of the scrubbing water, and thus its cleaning efficiency.
The scrubber unit, built entirely from highly corrosion resistant materials, will be located on the port side of the exhaust gas funnel. The gas inlet to the scrubber unit is arranged in the lower section. Scrubbing water is pumped from the wet sump, through the seawater heat exchanger, to the top part of the scrubber and sprayed into the exhaust gas flow. The water absorbs the SOX, heat and other components from the exhaust gas. The 40 foot equipment container, which includes amongst other things the bleed-off treatment units, will be located in front of the superstructure on the port side.
- Wärtsilä SOx Reducer - scrubbing system PDF, 390Kb »
- Wärtsilä Environmental Product Guide PDF, 3Mb »
- Wärtsilä Environmental Services PDF, 2Mb »
- First order for Wärtsilä SOx scrubber PDF, 210Kb »
- First order for Wärtsilä SOx scrubber PDF, 146Kb »
- Leading the way in cleaning SOx from marine exhaust gases PDF, 293Kb »
- Wärtsilä scrubbers certified to combat SOX emissions PDF, 92Kb »
- SOx scrubbing of marine exhaust gases PDF, 175Kb »
- Exhaust Gas Scrubbing Systems PDF, 2Mb »