The Florida Department of Environmental Protection on March 13 issued to Florida Power & Light a final air construction permit for an upgrade project at the gas-fired Fort Myers plant.
The permit authorizes the installation of General Electric 7FA.04 components to improve the performance of Unit 2 (Units 2A through 2F). The existing facility is located at 10650 Palm Beach Boulevard (State Road 80), Fort Myers, Fla.
This facility includes twelve 63 MW (each) simple cycle gas turbine peaker units, six 250 MW (each) combined-cycle combustion turbines, two 170 MW (each) simple-cycle combustion turbine peaking units, diesel engines and supporting equipment.
FP&L is now authorized to conduct the following work on Unit 2 (designated as Units 2A through 2F) including the replacement of various components of the GE Series 7FA.03 gas turbines with upgraded components of the Series 7FA.04 version including (but not limited to):
- New hot gas path components;
- New combustion liners and flow sleeves; and
- New control software.
FP&L applied in December 2013 at the Florida Department of Environmental Protection for this permit, allowing 5% uprates of the affected turbines. The application, prepared by consultant Golder Associates, noted that Fort Myers Unit 2’s six gas turbines are permitted to fire only natural gas. The turbines are called Units 2A through Unit 2F, with each rated at a total of 250 MW. In describing these six turbines and how they are configured, the application said: “6-on-1 combined cycle system consisting of six nominal 170 MW GE 7FA.04 combustion turbine-electrical generator sets with unfired HRSG that produces sufficient steam to generate additional 80 MW.”
There are other turbines at the plant outside of Unit 2 that are not covered by this permitting. The GenerationHub database shows the plant’s total capacity as 2,828 MW.
The current design heat input rates for the six turbines are 1,535 million British thermal units per hour (MMBtu/hr). There will be no change in the type of permitted fuels as a result of the project. The design heat input rate for natural gas firing will increase by 29 MMBtu/hr (2%) based on General Electric data on 7FA.04 turbines at 75°F ambient temperature.
“The purpose of the project is to improve the performance of the GE Model MS7241 turbines with 7FA.04 components,” said the application. “The components being replaced are typically those requiring routine replacement due to normal operation. However, replacing the 7FA.03 components with 7FA.04 components results in higher efficiency and provides approximately a 5 percent increase in output power per turbine with an approximate two percent decrease in heat rate (heat input/output power) per turbine (1-percent for combined-cycle operation).”