The Florida Department of Environmental Protection on Feb. 4 issued a final air construction permit to enable simple cycle operation down to a combustion turbine load of 30% on the four combustion turbines of Unit 4 at Duke Energy Florida‘s P.L. Bartow Power Plant.
The facility is located in St. Petersburg in Pinellas County. The plant includes these power generating units.
- Four 59-MW General Electric MS7000 simple cycle gas turbine peaking units, designated as Nos. P-1, P-2, P-3 and P-4; and
- Combined-cycle Unit 4, consisting of four 215-MW Siemens SGT6-5000F combined cycle gas turbine-electrical generators (CTs) and four duct-fired heat recovery steam generators (HRSGs). The steam generated in the four Unit 4 HRSGs is used in a single nominal 420-MW steam turbine-electrical generator (STG).
Following installation of the Advanced Low-Load Turn Down (ALLTD) package from Siemens on the four Unit 4 CTs, the permit authorizes simple-cycle operations down to a turbine load of about 30% for natural gas and 45% for fuel oil. Each CT is capable of firing low-sulfur distillate fuel oil for the equivalent of 1,000 hours per year. Unit 4 entered commercial operation in the summer of 2009.
The Siemens ALLTD package may consist of additional piping and auxiliary valves to bypass air around the combustion system, additional piping and auxiliary valves for air recirculation in the compressor section, enhanced control software, or similar enhancements to facilitate reduced emissions at lower-load operation.
Duke Energy Florida is a unit of Duke Energy (NYSE: DUK).