Stricter environmental regulations are forcing many utilities to install flue gas desulfurization (FGD) systems to control sulfur dioxide (SO{sub}2) emissions below levels that can be attained by burning Powder River Basin (PRB) coal alone. The choice for many applications is wet-limestone scrubbing, a proven technology. Startup of the new scrubbers, combined with the many workforce retirements that are coming or have already occurred, will force many new personnel to learn FGD details. Properly controlling chemistry in these systems is vital for issues such as scale control, good reagent utilization and corrosion prevention. This article examines important concepts of wet-limestone scrubbing.
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