Florida Power and Light Company (FPL) is developing the new 1,250MW Port Everglades Next Generation Clean Energy Centre (PEEC) to replace the existing Port Everglades power plant of the 1960s.
FPL demolished the Port Everglades power plant in 2013 and plans to begin construction of the new $1bn combined-cycle power plant in the second quarter of 2014. The new facility is expected to commence operations in 2016 and is estimated to produce clean electricity to provide for approximately 260,000 homes and businesses.
PEEC is expected to have an operational life period of 30 years, and is expected to create 650 direct and 1,000 indirect jobs during construction, and generate approximately $20m as tax revenue for the local government during its first year of operation.
PEEC location and make-up
Port Everglades power plant located near Fort Lauderdale in Broward County, Florida, was demolished using approximately 450lb of explosives. Dynamite charges were used for blasting the stacks while explosive charges were used for blasting the steel boilers.PEEC will feature a natural gas-fired combined cycle unit and other ancillary equipment. Natural gas will be used as primary fuel while ultralow sulphur distillate fuel oil will be used as backup fuel.
The plant will feature three 250MW combustion turbine generators equipped with evaporative inlet cooling system, a 500MW steam turbine generator, three heat recovery steam generators (HRSG) with selective catalytic reduction reactors and three 149ft exhaust stacks.
The combustion turbine generator (CTG) will comprise a continuous emission monitoring system (CEMS) for holding the NOx emissions in accordance with acid rain provisions. Each combustion turbine generator will fire natural gas with a maximum sulphur content of 2.0 grains per 100scf.
Ancillary equipment will include two temporary boilers to be used during construction, two emergency generators, a diesel fire pump, two process heaters and a gas compression station.
Power generation at PEEC
The combustion turbine generator, which is an internal combustion engine operating in a rotary rather, is coupled with an electrical generator. Ambient air will be compressed in the multi-stage compressor unit of the CTG. The compressed air will be directed to the combustor section, comprising individual steam-cooled Dry Low NOx (DLN) combustors, where fuel will be introduced, ignited and burned.
Hot combustion gases will be routed through the steam-cooled transition pieces and diluted with additional cool air from the compressor before transporting to the turbine (expansion) section.
In the turbine section, energy will be recovered in the form of shaft horsepower, most of which is required to drive the internal compressor section. The remaining recovered shaft energy will be used to drive the external load units, such as the electrical generator.
Turbine exhaust gas released at a temperature of more than 1,125ºF from the CTG units will be used to produce steam in the heat recovery steam generator. The generated steam will be used to drive the steam turbine for producing electrical power.
Turbine technology at the plant
PEEC will be equipped with SGT6-8000H gas turbine (H-Class) provided by Siemens. The turbine has a gross power output of 274MW, operates at a maximum speed of 3,600rpm and has a thermal efficiency of approximately 60%.
The turbine will have a faster start-up and cycling capability for supporting intermediate to continuous duty operation.The H-class gas turbine is internally air-cooled and equipped with enhanced sealing system for minimising the cooling air loss. The attached active turbine clearance control system will reduce the engine performance losses occurring during the operations phase.
Contractors involved with the project
Zachry Engineering was awarded the engineering, procurement and construction (EPC) contract for the project. Siemens was awarded the contract for supplying H-class gas turbines for the new energy centre.
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