Two Ro-Ro vessels of are to be retrofitted with Wärtsilä in-line closed-loop scrubber systems. The scrubbers will[ds_preview] be installed on the »Stena Transit« and »Stena Transporter« in Q4 2015 and Q1 2016. »This is the first ever order for an in-line closed loop scrubber system, as the in-line option has earlier only been available with open loop systems.
The compact design of the in-line system saves space and it also facilitates easier and faster installation, thereby reducing the length of time that the vessel needs to be out of service for retrofitting«, Wärtsilä states. According to the Finnish company, the closed loop scrubber system operates so that 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. The cleaned effluents can be safely discharged overboard without causing harm to the environment.
