Electric Power Research Institute Incorporated

Joseph R Peterson

David R Owens

Oliver W Hargrove, Jr

Miriam Stohs

Ron C Skarupa

David M Seeger

A process is provided for removing vapor phase selenium species produced by the combustion of selenium and sulfur-containing fuel of the kind used to generate electric power in conjunction with a flue gas desulfurization process. In one process embodiment the flue gas leaving the combustion system is humidified by the injection of atomized water or a dilute alkaline slurry at a selected location upstream of the flue gas desulfurization system to cool the flue gas from a temperature of about 300.degree. F. to a temperature of about 280.degree. F. so as to enhance the selenium removal efficiency. In another process embodiment the flue gas leaving the combustion system is first humidified to cool the flue gas from a temperature of about 300.degree. F. to a temperature of about 200.degree. F. so as to enhance the selenium removal efficiency, and then an alkaline sorbent material is injected into the humidified flue gas. Selenium species are removed from the flue gas with the particulates in a particulate control device between the combustion system and the flue gas desulfurization system.

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Joseph R Peterson