Impact of Coal Blending and SO{sub}3 Flue Gas Conditions on Mercury Removal with Activated Carbon Injection at Mississippi Power's Plant Daniel

摘要

While powdered activated carbon (PAC) sorbent injection has been demonstrated to reduce mercury emissions for many coal-fired power plants, multiple configuration and operating variables exist that may influence the effectiveness at a given site. Southern Company and Mississippi Power Company contracted ADA-ES, Inc., to conduct a sorbent injection demonstration program at Plant Daniel Unit 1 during Spring 2005. The test was conducted on one-quarter of the 540-MW unit. This program exposed key variables that impacted mercury emissions and control. Plant Daniel can operate at varied bituminous/subbituminous coal blends and can fire several types of bituminous coal. The most interesting result was the dramatic influence of SO{sub}3 injection on the mercury removal capability of both native and sorbent-based capture. The injection rate strongly dictated whether sorbent injection could be considered an option for future mercury emissions compliance at this site.