Polk Combined Cycle Conversion-Tampa Electric

Alert 1123     Vogt Power to supply HRSGs to TECO’s Polk Power Station

Vogt Power International, a unit of Babcock Power, announced that Tampa Electric (TECO) chose them to supply four new heat recovery steam generators (HRSGs) to a four-on-one combined cycle configuration at TECO’s Polk Power Station in Florida. The project will capture waste heat from the combustion turbines to increase the output of gas-fired units by 70 percent. It is expected to be completed by January 2017.

Project Title: 

     First Entry Date: 3/1/2008

     Revision Date: 4/1/2013

                 Location: FL    

                 Startup Date: 2017

                 Size: 500  MW

                 Primary Fuel: Gas    

                 Secondary Fuel:  

                 Duct Burner:     

                 Duct Burner Supplier:  

                 Oxidation Catalyst:     

                 Oxidation Catalyst Supplier:  

                 NOx Limit:            

                 CO Limit:  

                 VOC Limit:            

                 PM limit:  

                 SO2 Limit:             

                 NH3 limit:

          Description:

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http://www.floridapsc.com/library/FILINGS/12/06137-12/06137-12.pdf

 Tampa Electric proposes to license, construct and operate Polk 2-5, a natural gas combined cycle ("NGCC") power plant at Polk Power Station, a 2,800-acre site located in Polk County, Florida, 40 miles southeast of Tampa. The site currently consists of Polk Unit 1, a 220 MW IGCC plant, and four CTs totaling a net 604 MW in the summer. Polk 2-5 is expected to generate a net 1,195 MW of electricity in winter and 1,063 MW in the summer. Polk 2-5 will result from the conversion of Tampa Electric's four existing CT generating units, Polk 2 through 5, at Polk Power Station into a modem NGCC generating facility, thereby making efficient and economic use of what is otherwise waste heat exhausted from the existing CTs. The energy from this waste heat is captured in four new heat recovery steam generators ("HRSGs"). The steam created in the HRSGs is directed to a single steam turbine generator. With additional supplemental firing of the HRSGs the single steam turbine will generate 459 MW of summer capacity and 463 MW of winter capacity. This generation will allow Tampa Electric to meet a projected need for additional generating resources that begins in 2017 and increases each year thereafter.

1.         The addition of heat recovery will provide a 37 percent increase in the generating efficiency of the four CTs incorporated into Polk 2-5, thereby significantly reducing fuel costs. The inherent efficiencies associated with this opportunity will inure to the economic benefit of Tampa Electric's customers, and will do so in a manner that has improved environmental impacts.

2.         Polk 2-5 will be a NGCC facility consisting of four CTs, four HRSGs with incremental supplemental firing and a single steam turbine arranged such that each of the four existing CTs will be coupled with a HRSG, with the output of the four HRSGs driving a single steam generator (referred to as a 4x4x1 configuration). The technology is a combination of a combustion turbine (Brayton) cycle and a traditional steam (Rankine) cycle technologies. The combination of these two technologies allows for thermal efficiency of almost 50 percent. This is a proven system for power generation and one with which Tampa Electric has significant experience designing, constructing and operating.

3.         Capturing waste heat from the existing Polk CTs 2-5 will generate an incremental net 352 MW of electricity in winter at 32 degrees Fahrenheit and 339 MW in the summer at 92 degrees Fahrenheit. The HRSGs installed at Polk 2-5 will also utilize supplemental firing of natural gas, also known as duct burners, to generate additional steam and provide 120 MW (summer) and 111 MW (winter) of cost-effective peaking capacity that will offset the need for future peaking unit capacity.

1.         The existing cooling reservoir at the Polk Power Station will be used for cooling the steam from the new steam turbine on Polk 2-5. Use of the existing cooling reservoir infrastructure reduces costs and will allow Polk 2-5 to operate with lower water consumption and lower parasitic load than if a stand-alone cooling tower were used for the steam turbine heat rejection system.

2.         A new small cooling tower will be constructed to provide equipment for auxiliary cooling for Polk 2-5 as well as Polk Unit 1. This is needed to optimize the heat loading on the existing cooling reservoir and mitigate operational impacts that could occur due to increased water temperature in the cooling reservoir.

3.         The Project is being designed to allow operation of each CT in either simple cycle or combined cycle mode. This will provide considerable operating flexibility and will allow the facility to serve both intermediate and peaking load requirements.