Techno-economic comparison of simple and modified gas turbine cycles
Department of Mechanical Engineering, University of Port Harcourt, PMB 5323, Choba, Port Harcourt, Rivers State, Nigeria.
Research Article
International Journal of Scholarly Research in Engineering and Technology, 2025, 05(01), 001-018.
Article DOI: 10.56781/ijsret.2025.5.1.0024
Publication history:
Received on 26 November 2024; revised on 08 January 2025; accepted on 10 January 2025
Abstract:
This study investigates the integration of various waste heat recovery cycles as bottoming cycles to enhance the efficiency of gas turbine power plants. The primary focus is on the combined Gas Turbine, air bottoming cycle -Kalina cycle-organic Rankine cycle (GT-ABC-KC-ORC) configuration, which was compared to a simple cycle gas turbine (GT-KC) configuration. The analysis revealed that the GT-ABC-KC-ORC model achieved a superior overall plant efficiency of 53%, yielding an energy output of 238,573.9 kW—an increase of 42.5% over traditional systems. Additionally, this configuration produced the lowest exhaust temperatures, minimizing thermal pollution. The economic assessment indicated that the GT-ABC-KC-ORC model not only had the lowest cost of electricity generation but also required less investment in equipment compared to the GT-KC model. The cost analysis showed that upgrading a simple cycle gas turbine (GT) to the GT-ABC-KC-ORC would require an additional investment of 131.3% of the GT's cost, compared to 185.6% for the GT-KC upgrade. These findings underscore the potential of the GT-ABC-KC-ORC configuration as a cost-effective and efficient solution for enhancing power generation through waste heat recovery. Further research is recommended to explore different combinations of bottoming cycles to optimize waste heat recovery systems.
Keywords:
Kalina Cycle; Economic Analysis; Waste heat; Modified cycles; LCOE; Efficiency
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