Economizer with an integral gas bypass

摘要: A method and means for extracting heat from an exhaust stack under highly corrosive fluctuating conditions. An in-line gas exchanger having selective dual concentric paths a plurality of longitudinal structural stringers to insure against weakening the stack. coils are located in outermost path is provided fully draining liquid contents thereof. Temperature control apparatus both regulating temperature fluid within exchange controlling critical dewpoint situations.