“First ever” in-line closed-loop scrubber order

17 Feb 2015
‘Stena Transporter’ will become one of the world’s first vessels to be fitted with an in-line closed-loop scrubber system

‘Stena Transporter’ will become one of the world’s first vessels to be fitted with an in-line closed-loop scrubber system

Wärtsilä has won a contract from Stena to install the “first ever” in-line closed-loop scrubber system to two of its ro-ro ferries, helping the operator to achieve emissions compliance.

The scrubbers will be installed on the Stena Transit and Stena Transporter ferries operating between Hoek van Holland in the Netherlands and Killingholme in the UK, which falls within the North Sea's Sulphur Emission Control Area (SECA).

Juha Kytölä, vice president, environmental solutions, Wärtsilä Ship Power, said: "Our extensive experience in retrofitting projects added considerable value to our engineering preparations for the project, and has thus helped the customer in their discussions with the yard.”

Wärtsilä said this is the first ever order for an in-line closed loop scrubber system, as the in-line option has only previously 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's closed loop scrubber system operates with the wash water 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 neutralised meaning that the cleaned effluents can be safely discharged overboard without causing harm to the environment.

The retrofitting of the vessels is scheduled to take place in Q4 2015 and Q1 2016.

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