Combined Cycle A subsystem of electric power generation

Tennessee Valley Authority (TVA) John Sevier Combined Cycle Plant [1]

TVA [2]

Technology Overview

Typical Plant DesignMulti-Shaft

General Electric (GE) FlexEfficiency 60 Combined Cycle Power Plant [3]

Typical Plant DesignSingle Shaft

GE FlexEfficiency 50 Combined Cycle Power Plant [4]

Operational SpecificsGas Turbine

Seimens SGT5-4000F [5]

GE [6]

Operational SpecificsHeat Recovery Steam Generator

Energy Extraction Partners [7]

Operational SpecificsSteam Turbine

GE D-17 Steam Turbine [8]

Rotor Stator Diagram [9]

Typical Technical DataTechnical Performance

Net Power New & clean: 540 MW (baseload), 610 MW(peak)Lifetime average: 528 MW (baseload), 597MW (peak)

Operating Limits Minimum load: 40 %.Cold start: 3 hoursRamp rate: 7 %/min

Scheduled outages Scheduled outage factor: 4% (15 days/yr).

Forced outages Forced outage rate: 4%Mean time to repair: 24 hours

Availability 92%

Heat rate (HHV, net, ISO conditions)

New & clean (Btu/kWh): 6880 (baseload);9290 (incremental duct firing); 7180 (fullpower)Lifetime average (Btu/kWh): 7030(baseload); 9500 (incremental duct firing);7340 (full power)

Northwest Power Planning Council [10]

[12]

Total Power GeneratedGas

TurbinesSteam Trubines

Series1

0% 25%

50%

75%

Efficiency

Open CycleCombined Cycle

[11]

Generation Sub CategoriesIntegrated Solar Combined Cycle (ISCC)

[13]

Generation Sub CategoriesIntegrated Gasification Combined Cycle (IGCC)

Carbon Capture Technology [14]

Environmental Ramifications

Emissions (Plant site, excluding gas production & delivery)Particulates (PM-10) Typical actual: 0.007 T/GWh

Sox Typical actual: 0.002 T/GWh

Nox Typical actual: 0.039 T/GWh

CO Typical actual: 0.005 T/GWh

Hydrocarbons/VOC Typical actual: 0.0003 T/GWh

Ammonia Typical actual: 0.0000006 T/GWh

CO2 411 T/GWh (baseload operation) 429 T/GWh (full power operation)

Northwest Power Planning Council [10]

ENVIRONMENTAL IMPACT ASSESSMENT STUDY REPORT [15]

[16]

Energy Security Issues

Annual EnergyOutlook 2012 [18]

Future of Technology

Annual EnergyOutlook 2012 [18]

Citations

1. http://www.tva.gov/sites/johnsevier_cc.htm2. http://www.tva.gov/power/comb_cycle_video.htm3. http://

www.ge-flexibility.com/solutions/flexefficiency-60-portfolio/index.html4. http://

www.ge-flexibility.com/solutions/flexefficiency-50-portfolio/index.html5. http://

www.energy.siemens.com/hq/en/fossil-power-generation/gas-turbines/sgt5-4000f.htm#content=Description

6. http://www.ge-flexibility.com/power-generation-basics/how-a-gas-turbine-works/index.html

7. http://eep-ces.com/technology/8. http://

www.ge-flexibility.com/products-and-services/steam-turbines/D17-steam-turbine.html

9. http://www.learnengineering.org/2013/02/working-of-steam-turbine.html

10.http://www.westgov.org/wieb/electric/Transmission%20Protocol/SSG-WI/pnw_5pp_02.pdf

11.http://memagazineblog.org/2012/07/01/efficiency-by-the-numbers/12.http://

electrical-engineering-portal.com/an-overview-of-combined-cycle-power-plant

Citations cont.

13.http://www.esolar.com/applications/power-iscc/14.http://engineering.wustl.edu/contentfiles/ecc/Backus.pdf15.http://www.miga.org/documents/Ashugani_EIA.pdf16.http://savannahnow.com/exchange/2011-08-10/new-pollution-standar

ds-impact-local-power-plants#.U0S0v_ldV8E

17.http://sites.lafayette.edu/egrs352-fa12-combinedcycle/files/2012/11/Annual-Energy-Outlook-2012.pdf

18.http://www.eia.gov/forecasts/aeo/pdf/0383(2012).pdf