Flue Gas Desulfurization (FGD) Limestone Calculator
Compute daily reagent limestone consumption, Ca/S molar stoichiometry, SO2 mass reduction, and commercial-grade gypsum byproduct yield.
Boiler Fuel & Flue Gas Inputs
Standard wet limestone: 1.03 to 1.08
FGD Reagent & Gypsum Results
Daily Limestone Reagent Required:
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Commercial Gypsum Produced:
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Uncontrolled SO2 Emission:
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Controlled Stack SO2 Emission:
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Daily SO2 Captured:
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Daily Coal Fired:
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Wet Limestone-Gypsum FGD Chemistry
Wet flue gas desulfurization (FGD) scrubbers neutralize acidic sulfur dioxide ($SO_2$) gas generated from coal and heavy oil combustion by spraying an aqueous slurry of pulverized limestone ($CaCO_3$). Forced in-situ air oxidation converts the intermediate calcium sulfite into commercial-grade synthetic gypsum ($CaSO_4 cdot 2H_2O$) used in drywall manufacturing.
Overall Chemical Reaction
CaCO₃ + SO₂ + ½ O₂ + 2 H₂O → CaSO₄·2H₂O (Gypsum) + CO₂