Reduction of SOx Emission

SOx or Sulphur oxides are formed during combustion process in the engine because of presence of sulphur content in the fuel.

Following are the methods used to reduce sulphur emission from marine engines.

Use of Low Sulphur Fuel Oil

It is expensive but most commonly used method to comply with annex VI of marpol while entering emission controlled area(ECA).

Exhaust Gas Scrubber Technology

The exhaust gas from the engine is passed through the scrubber tower where a liquid is showered over it. Fresh water blended with caustic soda is used as a scrubbing liquid which reduces the SOx to 95%.
The scrubbing water is then sent to a water treatment effluent emulsion breaking plant after which it can discharged overboard.

Ships using separate fuel oils entering or leaving an Emission Control Area must carry a written procedure showing how the fuel oil change-over is to be done, allowing sufficient time for the fuel oil service system to be fully flushed of all fuel oils exceeding the applicable sulphur content prior to entry into an Emission Control Area.

The volume of low sulphur fuel oils in each tank as well as the date, time, and position of the ship when any fuel-oil-change-over operation is completed prior to the entry into an Emission Control Area or commenced after exit from such an area, shall be recorded in the Sulphur record book.

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