The Orlando Utilities Commission applied June 11 at the Florida Department of Environmental Protection for an air permit that covers SO2 scrubber upgrades on Unit 1 of its Stanton power plant, addition of selective catalytic reduction (SCR) on Unit 1, and addition of dry sorbent injection (DSI) systems to both Units 1 and 2.
The commission said that these installations are needed to comply with both the Cross-State Air Pollution Rule (CSAPR) and the Mercury and Air Toxics Standards (MATS), both of which are recent air emissions control initiatives of the U.S. Environmental Protection Agency.
Phase 1 of the Unit 1 scrubber (flue gas desulfurization) upgrades was completed previously under a prior DEP approval, with the latest permit needed for Phase 2 upgrades. The Phase 2 upgrades were actually permitted at one point, but Orlando didn’t complete them by a DEP deadline at the end of 2008.
Orlando said it commissioned a study from Black & Veatch, with the assistance of Wheelabrator Air Pollution Control Co., to look at FGD upgrades for Unit 1. Orlando said it is in the bidding process for an FGD vendor that can provide the most cost-effective upgrades that would allow it to meet a new SO2 emissions target of 0.2 lbs/mmBtu (30-day average). “The final upgrades will work in conjunction with the previous upgrades to reduce SO2 emissions up to the maximum design coal sulfur content of 3.5% that OUC sees in its fuel deliveries,” the application noted.
The commission plans to essentially “duplicate” the existing SCR on Unit 2 at Stanton on Unit 1. The new SCR on Unit 1 would primarily reduce NOx emissions, but will also help with mercury reduction needs, Orlando added.
The DSI systems for Units 1 and 2 would use hydrated lime to reduce pollutants like SO3 and mitigate “blue plume” problems that might come up due to the SCR installation. A temporary DSI system was tested on the plant in December 2011.
Stanton Unit 1 began commercial operation in 1987 and has 444 MW of capacity, said the Orlando website. Stanton Unit 2 began commercial operation in 1996 and has 446 MW of capacity.
U.S. Energy Information Administration data shows Stanton taking coal in March from the No. 1 Plant in eastern Kentucky of Alpha Natural Resources (NYSE: ANR) and from the Logan & Kanawha Coal unit of James River Coal (NASDAQ: JRCC) out of the Bevins Branch prep plant in eastern Kentucky.