In order to meet pollution compliance requirements, many Utilities are adding wet scrubbers to reduce SO2 emissions. The gas temperatures produced by wet scrubbers also can lead to increased condensation of
moisture on interior surfaces of chimney linings and ductwork. This increased condensation can, in turn, increase the risk of corrosion.
To protect moist surfaces of chimney liners and ductwork from acid attack, new design and construction methods are required. Materials including high nickel, chrome and titanium alloys are being employed as well as modifications to the widely used acid resistant brick liners which have been conventionally used. This paper explores the experience of chimney manufacturers and builders to address the requirements of
operation with wet scrubbers. This includes issues of liner velocities, liquid carryover, the use of new materials and construction techniques.
KEYWORDS: Chimney, Stack, Liner, FGD, Wallpaper, Clad.