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The traditional FGD process based on limestone (CaCO3 ) can also be used with Wärtsilä diesel engines fired with high sulphur fuel oils.
The CaCO3 FGD system is a complicated desulphurization process, of which feasibility appears when cheap high sulphur fuel oils are burned and especially when the power plant is relatively big. The typical SO2 removal efficiency is between 80-90 %.
In addition to the need of alkali (limestone), the wet FGD systems are famous for the need for the big amount of process water of appropriate quality.
Gypsum is produced by the limestone FGD system as end-product. Gypsum disposal and utilization possibilities should be studied carefully in an early project phase.
Features
- Applicable for SO2 removal with Wärtsilä diesel engines
- Typically feasible for big plants fired with high sulphur fuel oils
- Efficient SO2 removal; up to 90 % depending on the design
- Normally 0,6-1,0 m3/MWh water needed depending on the heat recovery type
- Water quality according to the specification; especially low chloride content
- Appropriate limestone with high enough reactivity and fine size distribution required
- Gypsum as end-product
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