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Flue Gas Desulfurization

Home ApplicationFlue Gas Desulfurization

Flue Gas Desulfurization

Flue Gas Desulfurization – For Cleaner Emissions

Flue Gas Desulfurization (FGD) systems are designed to remove sulfur dioxide (SO₂) from industrial flue gas through wet, dry, or semi-dry desulfurization processes. By reducing SO₂ emissions, FGD systems help control acid gas pollution, reduce the formation of acid rain, and support compliance with environmental emission standards.

These systems are widely used in industries such as power generation, metallurgy, cement and building materials, chemical processing, and waste incineration, where sulfur-containing fuels or raw materials can generate significant SO₂ emissions.

Many desulfurization systems are installed in industrial plants.

Generation

Industrial SO₂ is mainly generated when sulfur-containing fuels or raw materials are burned or thermally processed.

Typical sources include:

Coal-fired power plants
Industrial coal-fired boilers
Cement kilns
Steel and sintering plants
Non-ferrous metal smelting
Petroleum refining
Sulfuric acid and chemical production
Waste incineration
Other sulfur-containing combustion processes

Large quantities of coal are stored at coal-fired power plants.

Treatment

For a large coal-fired power plant, a typical flue gas treatment sequence may be:

Boiler → SCR → ESP / Baghouse → FGD Absorber → Mist Eliminator → ID Fan → Stack

After particulate removal, the flue gas enters the FGD absorber and comes into contact with limestone slurry or another alkaline absorbent.

SO₂ is transferred from the gas phase into the liquid phase and reacts with the alkaline reagent, forming sulfite, sulfate, or gypsum products.

Flow diagram of the flue gas desulfurization process.