Explain the design of a wet flue gas desulfurization (FGD) system for a coal-fired power plant.

Wet FGD removes SO2 using alkaline slurry (typically limestone). Design parameters: SO2 inlet concentration, removal efficiency (>95%), L/G ratio (10-20 L/m3), gas velocity through absorber (3-4 m/s), and slurry pH (5-6). Absorber tower design: spray zone for gas-liquid contact, mist eliminator, recirculation pumps (100-300% of gas flow), and oxidation air for gypsum formation. Materials: rubber-lined carbon steel or alloys for corrosion resistance. Byproduct handling: gypsum dewatering for wallboard production or disposal. Energy consumption: 1-2% of plant output. Consider limestone handling and wastewater treatment.