Abstract
The utilization of heat recuperators in high-temperature industrial processing facilities to recover the waste heat from flue gas streams and use it to preheat incoming combustion air can result in significant energy savings. Little information concerning the performance characteristics of most commercial alloys in various corrosive flue gas environments is available to guide materials selection for heat recuperators. This paper discusses four principal flue gas environments, i.e. oxidizing, sulfidizing, carburizing, and chlorine-contaminated environments, that are frequently encountered in high-temperature industrial processing systems. A ranking of relative alloy performance in these hostile environments for a variety of commercial alloys is presented in order to help the design engineer select the most appropriate alloys for construction of recuperators. Other materials properties that are of importance in the materials selection, including short-time tensile properties, creep rupture properties, and thermal stability, are also discussed.
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