FGD PROCESS

FGD Process reduces emission of SO₂  from various refinery flue gas streams, sulfur plants and spent acid regeneration units.

The process uses an aqueous amine solution to achieve highly efficient, selective absorption of SO₂ from flue gas.

Hot feed gas is quenched and saturated in a circulated water pre-scrubber.

The gas contacts the lean amine solution in a absorption column. SO₂ is absorbed and the treated gas exits the absorber to atmosphere.

Emission level of SO₂ to atmosphere is ensured below 30 ppmv by adjusting operating parameters. SO₂-rich amine from the absorption column is pumped through a lean–rich amine heat exchanger and then to the regeneration column.

Steam stripping regenerates the lean amine solution, and the water-saturated SO₂ is recovered.

Lean amine is pumped from the stripper reboiler to the absorption column through the lean–rich amine heat exchanger and the lean amine cooler.

SO₂ recovered is recycled to sulfur recovery unit to produce sulfur or it can be converted to sulfuric acid in a sulfuric acid unit.