PureSOx
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PureSOx Exhaust gas cleaning

Exhaust gas cleaning Alfa Laval’s PureSOx removes sulphur oxides from the ship’s exhaust gas by scrubbing it with seawater or freshwater. • Short payback time (1 to 2 years). • Sulphur removal rate >98% (exceeding IMO requirements). • Cost-saving solution (able to operate on HFO instead of expensive lowsulphur MGO). Introduction The unique hybrid design of Alfa Laval’s PureSOx gives both environmental and economical advantages. Shipowners can continue operating on heavy fuel oil instead of more expensive marine gas oil, while still meeting the strict International Maritime Organization...

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How does PureSOx work? Schematic overview of the PureSOx hybrid system. Freshwater circuit Seawater circuit Bypass damper NaOH monitoring Circulating tank Water cleaning Pump Seawater Sludge tank PureSOx facts: • Cost-saving solution (able to operate on HFO instead of expensive low-sulphur MGO). • Traps up to 80% of particulate matter. • Complies with MARPOL Annex VI – MEPC 59. • Proven technology, currently the largest scrubber installed on a vessel after a 21MW main engine. • Sulphur removal rate >98% (exceeding IMO requirements). • Able to operate in low alkalinity waters. • PureSOx is...

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Hybrid system Alfa Laval designed the hybrid system for maximum flexibility, combining a seawater and a freshwater system. In open sea, PureSOx operates on seawater, providing savings on caustic soda and freshwater. While in low alkalinity waters, harbours and estuaries, the system can operate on freshwater in a closed loop. In freshwater mode only small quanties of sludge are generated, which can be handled as normal engine sludge. Switching between seawater and freshwater mode can be done manually or automatically, based on the ship’s GPS positioning. To minimize energy consumption, water...

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Multiple-inlet systems Main and auxiliary engines can be combined into one system. Alfa Laval has developed PureSOx s ystems with multiple inlets in order to limit the number of scrubbers on board the vessel. Main and auxiliary engines can be combined in one system. The energy needed to drive the PureSOx pumps is automatically adjusted to the engine. Benefits of the multiple inlet system include: • Lower investment costs. By combining multiple engines significant savings are achieved on equipment and installation cost. • Smallest footprint. As space is limited on existing vessels, one...

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Multiple-inlet PureSOx system for main engines and auxiliary engines.

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Water cleaning The Alfa Laval cleaning system secures compliance with IMO Marpol Annex VI wash water criteria. Alfa Laval high-speed separation technology is used to clean the effluent, ensuring compliance with IMO wash water criteria according to Marpol Annex VI. This technology is well proven, and the footprint is smaller than many other water cleaning solutions. The unit measures, controls and logs the wash water content. • Simple process. No additional process steps needed, such as generation of air, ozone or other media. • Minimized sludge generation. The high-speed separation...

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Case studies Alfa Laval has initiated case studies with several shipowners on different vessel types to determine the impact of PureSOx on board their vessels. Based on each ship’s engines and operational profile, a PureSOx system was selected. Detailed studies were carried out to ascertain the best way to fit the system into the vessel. Return on investment calculations were also carried out for different scenarios. Installing PureSOx on board the Ficaria Seaways. Alfa Laval has tools that help shipowners determine the feasibility of a PureSOx system on board their vessels. Size, weight,...

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Case 1: Container feeder The container shipping sector in the Baltic and North Sea is highly competitive and fragmented. Both charterers and shipowners benefit from the installation of a scrubber, which lowers the operating cost of their vessels. Number of main engines Main engine power per engine (MW) Main consumption (tonnes/year) PureSOx data Type Hybrid, single inlet Exhaust gas mass (tonnes/hour) Weight (tonne) Sludge production (tonnes/year) Caustic soda consumption (tonnes/year) Freshwater consumption (tonnes/year) Location of the scrubber as viewed from the stern. Operational...

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Case 2: Aframax tanker In this case we evaluated the impact of a scrubber onboard an aframax tanker. As this study shows even when operating only 60% of the time in ECA, a scrubber is still an attractive solution. Number of main engines Main engine power per engine (MW) Main consumption (tonnes/year) Number of auxiliary engines Auxiliary power per engine (MW) PureSOx data Type Hybrid, multiple inlet Exhaust gas mass (tonnes/hour) Width (m) Weight (tonne) Extending the funnel backwards facilitates placement of the Scrubber. Sludge production (tonnes/year) Caustic soda consumption...

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Case 3: Ro-Ro ferry Ro-Ro vessels have powerful engines, as time is crucial in this market. The payback time for this type of vessel is consequently very short. Gross tonnage Number of main engines Main engine power per engine (MW) Main Consumption (tonnes/year) Number of auxiliary engines PureSOx data Type Hybrid, multiple inlet Exhaust gas mass (tonnes/hour) Weight (tonne) Sludge production (tonnes/year) Caustic soda consumption (tonnes/year) Freshwater consumption (tonnes/year) The footprint of PureSOx is minimized by extending the funnel sideways. Operational profile Operation area...

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Return on investment The tables show typical payback times for PureSOx. 4 MW engine 16 14 ROI [years]

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Alfa Laval in brief Alfa Laval is a leading global provider of specialized products and engineered solutions. Our equipment, systems and services are dedicated to helping customers to optimize the performance of their processes. Time and time again. We help our customers to heat, cool, separate and transport products such as oil, water, chemicals, beverages, foodstuffs, starch and pharmaceuticals. Our worldwide organization works closely with customers in almost 100 countries to help them stay ahead. How to contact Alfa Laval Alfa Laval and PureSOx are global trademarks owned by Alfa Laval...

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