The Florida Department of Environmental Protection on Jan. 5 issued a final air construction (AC) permit that in part authorizes the shutdown of the coal-fired Units 1 and 2 at Duke Energy Florida’s Crystal River power plant in Citrus County.
This existing facility consists of four coal-fired fossil fuel steam generating (FFSG) units with electrostatic precipitators; two natural draft cooling towers for FFSG Units 4 and 5; helper mechanical cooling towers for FFSG Units 1 and 2; coal, fly ash, and bottom ash handling facilities; limestone and gypsum material handling activities; hydrated lime storage and transfer system for Units 4 and 5; and, various fire pumps and generators.
Unit 3 is a retired nuclear facility.
The Crystal River facility continuously operates low-NOX burners, selective catalytic reduction systems (SCR), flue gas desulfurization systems (FGD) which includes limestone and gypsum material handling activities and acid mist mitigation (AMM) systems for Units 4 and 5.. In conjunction with the new control equipment, Units 4 and 5 are now also authorized to burn a blend of bituminous/sub-bituminous coal. Units 4 and 5 are newer, larger facilities that won’t be shut along with Units 1 and 2.
This permitting added several new permit conditions while also changing conditions in several previously issued AC and PSD air permits. The AC permit adds several conditions dealing with the future shutdown date of Units 1 and 2. In addition, previously issued AC/PSD permits have been revised regarding Units 4 and 5. These revisions lower the SO2 emission limit for the units from 0.27 pounds per million British thermal units (lb/MMBtu) of heat input based on a 30‐day rolling average to 0.25 lb/MMBtu based on a 30‐day rolling average. Compliance with the revised SO2 emission limit shall occur on or before Dec. 31, 2017.
“DEF is submitting this construction permit application to address the upcoming retirement of Units 1 and 2 and for incorporation of a new SO2 emission limit for Units 4 and 5,” said this Duke Energy (NYSE: DUK) subsidiary in the Nov. 18, 2016, permit application. “This permitting action is intended to allow DEP to confirm attainment for the 1‐hour SO2 National Ambient Air Quality Standard (NAAQS) for future years based on modeled emissions of the Crystal River Plant’s potential emission rates in response to the U.S. Environmental Protection Agency (EPA) Data Requirements Rule (DRR).”
Units 4 and 5 each consists of a pulverized coal, dry bottom, wall‐fired boiler rated at 760 MW. Up to now, under a Title V Operation Permit, Units 4 and 5 were limited to SO2 emissions of 0.27 lb/MMBtu of heat input based on a 30‐day rolling average for all periods of operation including startup, shutdown, and malfunction, as determined by CEMS data.
Modeled attainment can be demonstrated for future years based on the updated potential SO2 emissions factor of 0.25 lb/MMBtu for Units 4 and 5 and the inclusion of four combined cycle gas turbines to be operating in 2019 (part of the adjacent Citrus Combined Cycle Project (CCCP)). Crystal River Units 1 and 2 will be retired in conjunction with the operation of the CCCP.
Unit 1 is a pulverized coal, dry bottom, tangentially‐fired boiler rated at 440.5 MW. Unit 2 is a pulverized coal, dry bottom, tangentially‐fired boiler rated at 523.8 MW. DEF is including language in this new permit for a voluntary Dec. 31, 2018, shutdown date for Units 1 and 2, or prior if the CCCP commences operation by then.