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Industrial Scrubbers #1424036

Closed Loop Scrubber System

Wrtsil exhaust gas cleaning technology is an economical and environmentally friendly solution for tackling all new and existing SOx emission regulations, and provides flexibility and reliable operations wherever you operate. The scrubber system is designed to remove SOx from the exhaust and operates utilising wash water. The Wrtsil closed loop scrubber system works continuously in closed loop, which means that one does not need to worry about sea water alkalinity levels. This system is best suited for full time operation in low alkalinity areas (e.g. Great Lakes). In a closed loop scrubber system, the 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 neutralised. A small bleed-off is extracted from the closed loop and treated to fulfil IMO requirements. Cleaned effluents can be safely discharged overboard with no harm to the environment. If operation in zero discharge mode is requested, the effluent can be led to a holding tank for scheduled and periodical discharge.
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Open Loop Scrubber System

Wrtsil exhaust gas cleaning technology is an economical and environmentally friendly solution for tackling all existing and future SOx emission regulations, and provides flexibility and reliable operations wherever you operate. The scrubber system is designed to remove SOx from the exhaust and operates utilising seawater. The open loop scrubber system is our most straightforward scrubbing method. It utilizes the natural alkalinity in seawater for scrubbing, and does not need caustic soda. This method can be used in most seas around the world, where alkalinity levels are high. Exhaust gas enters the scrubber and is sprayed with seawater, the SOx in the exhaust reacts with water and forms sulphuric acid. Chemicals are not required since the natural alkalinity of seawater neutralises the acid. Wash water from the scrubber is treated and monitored to ensure that it conforms to MEPC 184(59) criteria and can be discharged into the sea with no risk of harm to the environment.
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Hybrid Scrubber System

Wrtsil provides hybrid scrubber system solutions which have the flexibility to operate in both open and closed loop using seawater to remove SOx from the exhaust. This provides a flexibility of operation in low alkaline waters, as well as the open ocean. When at sea the switch can be made to open loop using only seawater. The sulphur oxides in the exhaust react with the water to form sulphuric acid. Chemicals are not required since the natural alkalinity of seawater neutralizes the acid. When required to switch to closed loop, for instance whilst entering a port in a low alkalinity area, the natural alkalinity of seawater is boosted by an alkali which uses caustic soda (NaOH) as a buffer.
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