The Florida Department of Environmental Protection, in two separate actions on Jan. 21, both issued a draft air permit covering upgrades of two units at Florida Power & Light‘s Fort Myers Plant, and a final permit covering upgrades to another unit.
This facility includes 12 simple cycle gas turbine peaker units designated as Units GT1 through GT12. These GT units correspond to emission units (EU) 003 through 014 at the facility. These units began operation in May 1974. Each GT unit has a gross capacity of 63 MW. In addition to these units, the facility also includes six combined-cycle combustion turbines (designated as Units 2A through 2F) and two simple-cycle combustion turbine peaking units (designated as Units 3A and 3B).
The draft air construction permit covers the upgrading of Units 3A and 3b combustion turbines to improve their performance. This is an upgrade from a General Electric 7FA.03 to a GE 7FA.05 model, with the upgraded turbines called a “7FA.05 hybrid CT.” Under this permitting, FPL will be allowed to replace components of the early Series 7FA.03 gas turbines with upgraded components of the Series 7FA.04 version including (but not limited to) the following:
- New hot gas path components;
- New combustion liners and flow sleeves; and
- New control software.
“The purpose of the project is to improve the performance of the GE Model PG7241 turbines with 7FA.04 and 7FA.05 components that will result in a 7FA.05 hybrid CT,” said the DEP. “The installation of 7FA.04 and 7FA.05 components and DLN 2.6 will be accomplished during the normal scheduled maintenance and will provide approximately a 13-percent increase in output power per turbine with an approximate 2-percent decrease in heat rate (heat input/output power) per turbine. The 7FA.04 and 7AF.05 and DLN 2.6 components have a projected design heat input capacity approximately 8.5-percent higher than the current PG7241 model. As a result, there will be an expected increase in the design fuel flow for the units compared to same turbine inlet temperature based on manufacturer information.”
In the other Jan. 21 action, the DEP approved a final air construction permit authorizing the upgrade of the existing Unit 2A (emission unit 018) combustion turbine at Fort Myers with the GE 7FA.05 Hybrid Tech DLN 2.6+ combustion system. This request is in addition to the work previously authorized under two other permits where Unit 2 at Fort Myers is being upgraded with GE 7FA.04/7FA.05 components.
The GE 7FA.05 Hybrid Tech DLN 2.6+ allows an increased firing temperature and increases power output by 1.25% at an ambient temperature of 59 degrees Fahrenheit over the GE 7FA.04/7FA.05 components. The GE 7FA.05 Hybrid Tech DLN 2.6+ addition would be installed at the same time as the GE 7FA.04/7FA.05 upgrade components. FPL was also requesting to increase the current heat input limit for each Unit 2 CT from 1,760 to 1,783 million British thermal unit per hour (MMBtu/hr) because the heat input increase associated with the Hybrid Tech DLN 2.6+ combustion system upgrade will envelop all the units.