Innovative New Chimney Design for Wet Flue Gas

Abstract For removal of a large number of flue gas components, wet air pollution control (APC) equipment is often chosen as the best available technology. Low flue gas temperatures produced by these systems warrant the need for consideration of corrosion control in the flue gas systems, downstream of the wet APC-systems. This paper will present an innovative new chimney design. The design consists of a concrete shell and a glass block lining without an internal flue reducing the outside chimney dimensions and time to build the chimney considerably. Retrofit of APC equipment to an existing power plant usually poses considerable design challenges requesting scarcely available real estate. A quick to build, smaller foot-print new chimney will add to the solutions available. Additionally, the same design concept may be used in existing chimney structures. By removing the original flue, the flue gas opening in chimneys originally designed for high velocity hot flue gas evacuation is enlarged, making it suitable for accommodation of low temperature wet flue gases in a limited outage time. Cost of the different options will be discussed, taking into consideration construction schedules, manpower requirements, and local design restrictions to provide a realistic comparison basis for the respective design options