Localized Attack in FGD Air Pollution Control Vessels

摘要

To control emissions of sulfur dioxide from coal-fired electric power generation plants, wet limestone flue gas desulfurization (FGD) air pollution control systems are used. In recent times duplex stainless steels have been used for construction of the absorber vessels in these systems. The aggressive acid / halide conditions in the vessels have resulted in severe localized corrosion ... both pitting and crevice attack. Laboratory and in-situ testing programs were conducted to evaluate this attack and determine resistant materials for repair and future construction.