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The FGD process for removing sulphur dioxide can be based on use of sodium hydroxide (NaOH) as alkali.
The NaOH based FGD process is a simple and efficient desulphurization method for Wärtsilä diesel engines. This process is often used when the sulphur content of the fuel oil is relatively low due to its costly reagent. The typical SO2 removal efficiency can exceed 90 %.
In addition to the need of alkali (aqueous NaOH), the wet FGD systems are famous for the need of high amounts of process water.
Liquid effluent having high a salt content is produced by the NaOH scrubber as end-product. The effluent should be properly treated before discharging and the possible impacts of the discharge to be studied in advance.
Features
- Applicable for SO2 removal with Wärtsilä diesel engines
- Simple process
- Typically feasible for plants fired with low sulphur fuel oils
- Efficient SO2 removal; up to 90 % or more
- Normally 0,6-1,0 m3 /MWh water needed depending on the heat recovery type
- Water quality according to the specification
- Liquid effluent as end-product
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