Sea water

Systems of flue gas desulphurization on sea water
Flue gas channels, absorbers. Desulphurization plant. Payton, Indonesia

In process of desulphurization on sea water the natural alkalinity of sea water is used to remove sulfur dioxide of flue gases. Sulfur dioxide in gases reacts with sea water, which has pH from 5,5 to 7,0, forming hydrogen sulfite ion (bisulfite):

SO2 + 2 H2O * HSO3-+ H3O +

As a result of oxidation of hydrogen sulfite ion by oxygen, in clarifier tank of scrubber sulfate ions are formed:

HSO3-+ 0,5 O2 + H2O * SO42-+ H3O +

Wastewaters from the installation are discharged directly back into the sea.

Corrosion protection, applied in flue gas desulphurization plants on sea water

Loads in scrubbers of flue gas desulphurization plants on sea water cannot be compared with loads in calculus-gypsum plants. Main differences are:

  • temperatures much lower: 30-40 °C
  • sea water
  • NOT suspension

Standard materials of corrosion protection

  • Are sprayed, flake-like coverage (minimum 1,5 mm) and also linings armored by fiberglass mat
  • Good alternative – rubber lining, which advantage is - high elasticity/flexibility
Flakes usually have thickness 3-5 microns and diameter to 40 microns for spraying and to 3,2mm (1/8”) for trowel application Rubber is famous for its effective exploitation characteristics, has high resistance to vapor diffusion and sulfuric gas diffusion
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