Flow-Accelerated Corrosion (FAC) in Fossil and Combined Cycle/HRSG Plants

摘要

Although the mechanism of flow-accelerated corrosion (FAC) in fossil plants has been mostly understood for almost 40 years, it remains as one of the major safety issues for plant management and personnel. It can occur across the feedwater system from the condensate pump to the economizer inlet, with the heater drains systems being particularly prone. It is equally dangerous in both the single- and two-phase flow regions. In combined cycle/HRSG plants, FAC has also become the leading cause of availability loss in the HRSG and also occurs in both the single-and two-phase varieties. FAC is also the major damage mechanism in air-cooled condensers.