Wet scrubbers: SOx Removal Technologies from Marine Exhaust Gases Generated by Main Engines
Wet scrubbers: SOx Removal Technologies from Marine Exhaust Gases Generated by Main Engines
The sea water is sprayed into the scrubber tower in tiny droplets, the dissolved sulfur dioxide turns into sulfurous acid (H2SO3)
Bicarbonate (HCO3-) makes seawater slightly alkaline, used in a scrubber it neutralizes the acidity created by the sulfurous acid. Few helpers, NaOH or MgO, could be necessary.
Scrubber type:
Open-Loop Scrubbers (Scrubbing Medium: Seawater)
Closed-Loop Scrubbers (Typical Scrubbing Medium: Caustic Soda (NaOH))
Hybrid Scrubbers (Operation as Either Open-Close or Close-Open)
Scrubbers are sensitive pieces of equipment sitting in the hostile, hot and acidy environment of a ship’s funnel. Design accuracy and Fabrication quality are vital factors.
Marine Scrubbers using seawater for scrubbing liquor should need high alloyed materials.
Materials known to be used
22 Cr Duplex
25 Cr Duplex
6%Mo - e.g. 254 SMO
7%Mo
Alloy 31
Alloy 59
Other C-alloys - e.g. C-276
