;Contents: FGD processes--(FGD technology summary, and SO2 removal mechanisms); Selected FGD process descriptions and critical system operating parameters--(Lime/limestone scrubbing, sodium carbonate scrubbing, double alkali (soda lime) scrubbing, magnesium oxide scrubbing, and sodium sulfite (Wellman Lord) scrubbing); Implications of requiring 90 percent or greater SO2 removal for new FGD installations--(Lime and limestone scrubbing, sodium carbonate scrubbing, double alkali scrubbing, magnesium oxide scrubbing, and sodium sulfite (Wellman Lord) scrubbing); Effect of coal properties on FGD systems--(Coal heating value and moisture content, sulfur content of coal, ash content of coal, chlorine content of coal, and nitrogen content of coal); Reheat of scrubbed flue gases--(Purpose and need for reheat, methods of reheating, energy consumption, problems experienced, design, operation, and maintenance of reheaters, alternatives to reheat, and reheat summary).