REPOWERING OF EXISTING COAL-FIRED PLANT
ME 47100: Energy Systems Design
Fall 2022
Objective
The objective of this project is to design a combined cycle powerplant to replace the existing coal-fired Fayette Power Plant located in Austin, Texas.
Report
New Power Plant Components
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Combustion Gas Turbine: Siemens SGT6-9000HL (4)
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SC Net Output = 440 MW = 440,000W
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Efficiency: 43.2%
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SC Net HR = 47899 BTU/kWh
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Exhaust temperature of 1238°F
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Exhaust mass flow = 1,598 lb/s
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Steam Turbine: STF-A650 (3)
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​Rating: 100-300 MW,
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Efficiency = 48%
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Steam pressure = 2680 psi
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Reheat temperature upto 1,112°F
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Chiller (4)
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Heat Recovery Steam Generator (HRSG)
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Efficiencency = 89%
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Condenser
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Hot well pumps
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Efficiency = 70%
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Boiler feed pump
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​Efficiency = 70%
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Closed Feedwater Heater (CFWH) (5.07632 psia)
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Open Feedwater Heater/Deaerator (DA)
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Environmental Impact Components: SCR
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Concentrated Solar Thermal Power System
Siemens SGT6-9000HL
GE STF-A650
Total plant output with 4 gas turbines and 3 steam turbines: 2,660 MW
Fuel Selection / System
Natural Gas ​
System schematic / T-s diagram
T-s diagram
System schematic
System Analysis Results
Implementation of Renewable Source: Solar Energy
Modified T-s diagram
Modified flow diagram with addition of CSP
Results with the system improvement​s
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Heat Provided by CSP: 160 Million Btu/hr
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Turbine Work: 306.331 BTU/lbm (Increase by 15.1% Increase)
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Combined Thermal System Efficiency: 55.648% (1.708% Increase)
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Cycle Efficiency: 22% (3% Increase)