Scrubber System Designs

Wärtsilä has developed two kinds of standard scrubber designs to better meet the demands of our customers. Wärtsilä can offer the conventional venturi scrubber design, as well as the more compact inline scrubber system.

Both scrubber designs have benefits and drawbacks dependent on vessel type and layout, so it’s important to look at the specific project needs. Both designs can be utilized for open loop, closed loop and hybrid scrubber systems.

A more detailed comparison of the two types of designs can be found in the presentation.

    SOReduction - Wärtsilä cares about your compliance

    The reduction of sulphur oxide (SOx) emissions from marine vessels has been a priority for quite some time now.  IMO regulations to reduce SOx emissions from ships first came into force in 2005, under Annex VI of the International Convention for the Prevention of Pollution from Ships – known as the MARPOL Convention.  Since then, SOx emissions have continued to be scrutinized. From January 1st 2020, the limit for sulphur in fuel oil used on board ships operating outside designated emission control areas will be reduced to 0.50% m/m (mass by mass). This will significantly reduce the amount of SOx emanating from ships, therefore bringing tangible health and environmental benefits for the world – particularly for populations living close to ports and major shipping routes.

    The main type of bunker oil for maritime vessels is heavy fuel oil, derived as a residue from crude oil distillation. Crude oil contains sulphur which, following combustion in the engine, ends up in ship emissions. SOx are known to be harmful to human health, causing respiratory symptoms and lung disease. In a study on the human health impacts of SOx emissions from ships, it is estimated that by not reducing the SOx limit for ships from 2020, the air pollution from ships would contribute to more than 570,000 additional premature deaths worldwide between 2020-2025.  In the atmosphere, SOx can lead to acid rain, which can harm crops, forests and aquatic species, and contributes to the acidification of the oceans. Therefore, through limiting SOemissions from ships one will not only improve air quality, but will also aid in protecting our environment.

    Wärtsilä has developed a full wet scrubber portfolio to fit each of our customer needs, and to meet their requirements in the reduction of SOx.  The range of Wärtsilä exhaust gas cleaning system (EGCS) have been tested and certified according to IMO guidelines, thus ensuring safe operation and compliance

    Wärtsilä continuously strives for technological excellence, and to minimize the environmental impact of our scrubber systems. 

    A Wärtsilä EGCS is a compliant solution for the entirety of your vessel’s lifetime

    The Wärtsilä EGCS body is constructed from over 50% recycled steel

    Our EGCS are engineered with the option to include wash water treatment units in order to ensure the safest possible discharge back to seawater.   

    In addition, Wärtsilä EGCS not only reduce SOx, but also remove large levels of particulate matter (PM) and black carbon

    Wärtsilä cares about the compliance of your fleet.  And we have made it easy for you to get exactly what you need – a compliant and environmentally friendly exhaust gas cleaning solution.  Contact our Sales Team today to find out more.

    Press releases

    Wärtsilä exhaust scrubber systems to achieve emissions compliance for two Stena Line ferries

    by Wärtsilä Corporation | Feb 26, 2015

    Two Ro-Ro vessels owned and operated by Stena Line, the Sweden based transport and ferry company, are to be retrofitted with Wärtsilä in-line closed-loop scrubber systems. 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 U.K. The order was placed with Wärtsilä in December 2014 and the retrofitting is scheduled to take place in Q4 2015 and Q1 2016.

    By installing Wärtsilä scrubber systems, the ferries will comply with the regulations covering emissions of sulphur oxides (SOx) while using conventional residual marine fuel (HFO). The operating routes of these two ferries fall within the North Sea’s Sulphur Emission Control Area (SECA).

    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 inline 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.

    The Wärtsilä 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 sea 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.

    “Wärtsilä was the first company to be awarded certification for marine scrubber technology, and we are the clear market leaders in this field. Our in-house know-how of engines, scrubber systems and marine applications is backed by our extensive resources and global reach. Furthermore, 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. With the latest restrictions to sulphur emissions affecting more and more of the global fleet, our scrubber systems offer a competitive alternative to low sulphur fuels,” says Mr Juha Kytölä, Vice President, Environmental Solutions, Wärtsilä Ship Power.

    “Stena Line takes environmental issues very seriously and the retrofitting of Wärtsilä scrubber systems to these vessels will significantly lower their environmental footprint. We are also, in cooperation with Wärtsilä and other partners, converting the Stena Germanica on the route Göteborg-Kiel to be run on Methanol, another step in our strive to achieve sustainable shipping. In the scrubber retrofit we are especially happy with the in-line option, which means that the retrofitting will take less time and allow the ships to be back in service with a minimum of delay,” says Mr Bjarne Koitrand, Technical Director, Stena Line.

    As part of this contract Wärtsilä will, in addition to the scrubbers, also supply engineering support, technical advisor services, and commissioning of the systems.

    Link to image
    Caption: Stena Transporter is to be retrofitted with Wärtsilä in-line closed-loop scrubber systems.

     

    Media contact:

    Ms Britt-Mari Kullas-Nyman
    Director, Retrofit, Environmental Solutions
    Wärtsilä Ship Power
    Tel: +358 10 7091625
    britt-mari.kullas-nyman@wartsila.com  

    Ms Marit Holmlund-Sund
    Senior Manager Marketing, Communications, Ship Power
    Wärtsilä Corporation
    Tel: +358 10 709 1439
    marit.holmlund-sund@wartsila.com  

    Wärtsilä in brief:
    Wärtsilä is a global leader in complete lifecycle power solutions for the marine and energy markets. By emphasising technological innovation and total efficiency, Wärtsilä maximizes the environmental and economic performance of the vessels and power plants of its customers.
    In 2014, Wärtsilä's net sales totalled EUR 4.8 billion with approximately 17,700 employees. The company has operations in more than 200 locations in nearly 70 countries around the world. Wärtsilä is listed on the NASDAQ OMX Helsinki, Finland.
    www.wartsila.com

     

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