Survey of Dry SO2 Control Systems

摘要

The report gives results of an assessment of the status of dry flue gas desulfurization (FGD) processes in the U.S. for both industrial and utility applications. The assessment is based on reviews of past and current research, development, and commercial activities. Systems covered include: (1) spray dryers with either baghouse or electrostatic (ESP) particulate collectors, (2) dry injection of alkaline material followed by baghouse or ESP collection of wastes, and (3) other systems, such as coal-alkaline material feeds to a combustor and passage of flue gas through a fixed bed of alkaline material. A summary of dry FGD processes, including key features of three types of dry systems and commercial systems, is provided. Limited economic data are also presented. Conclusions and recommendations are given on the potential role EPA can take to advance the overall environmental acceptability of dry FGD systems as viable SO2 control alternatives.