The Florida Department of Environmental Protection on Jan. 6 issued a final air construction permit authorizing Gulf Power to upgrade the Unit 3 combined cycle combustion system at the existing Lansing Smith plant with General Electric Advanced Gas Path (AGP) and Optimized Load Path (OLP) enhancements to provide greater generating efficiency to the unit.
Gulf Power was also authorized to increase the hours of Power Augmentation/Peak Fire (OpFlex) operations for Smith Unit 3 from 1,000 to 1,500 hours/year/unit. The Lansing Smith facility is located in Bay County.
Emission units 004 and 005 (collectively designated as Unit 3) consist of two 170-MW General Electric combined-cycle combustion turbines, each with an electrical generator set and General Electric OpFlex Peak enhancement package designed to expand the peak power production profile.
Under this new permit, Gulf Power is authorized to conduct various work on Plant Smith Unit 3, including the replacement of components of the GE Series 7FA.03 gas turbines with upgraded components of the Series 7FA.04 versions including (but not limited to):
- New design stage 1 nozzle (S1N) and new S1N support ring;
- New design stage 1 buckets (S1B);
- New design stage 1 shroud blocks (S1SB);
- New design stage 2 nozzle (S2N);
- New design stage 2 buckets (S2B);
- New design stage 2 shroud blocks (S2SB);
- New design stage 3 nozzle (S3N);
- New design stage 3 buckets (S3B);
- New design stage 3 shroud blocks (S3SB);
- Low pressure drop DLN 2.6 combustion liners and flow sleeves;
- Cooling and sealing air orifice modification; and
- Cooling and sealing air piping modifications.
The unit will achieve a nominal 584 MW, at annual average site conditions, with duct burners. These units are capable of a maximum of approximately 608 MW in combined cycle operation with power augmentation and evaporative cooling at 65 degrees F. The maximum heat input of the combustion turbines is a nominal 1,927 MMBtu/hr Higher Heat Value (HHV) at 65 degrees F each. The maximum heat input of the duct burners is a nominal 306 MMBtu/hr (HHV at 95 degrees F) each.
Emissions from Units 004 and 005 are controlled by Dry Low NOX (DLN) combustors firing exclusively natural gas. Inherently clean fuels and good combustion practices are employed to control all pollutants. Each gas turbine is equipped with continuous emissions monitoring system (CEMS) to measure and record NOX emissions.
The coal units at the plant are not affected by this permitting.