Author(s)

Barinyima Nkoi^1*, Thank God Ebi Isaiah²

¹Department of Mechanical Engineering, Rivers State University of Science and Technology, Port Harcourt, Nigeria.
²Department of Mechanical Engineering, Niger Delta University, Wilberforce Island, Nigeria.

This paper aims at carrying out comparative performance analysis of simple and advanced cycles large-scale aero-derivative industrial gas turbines derived from aircraft turbofan engines. The investigation involves technical performances of three large-scale aero-derivative engine cycles based on existing and projected cycles for applications in land based power generation and Combined-Heat-and-Power (CHP). Preliminary design and performance simulation were implemented of a simple cycle (baseline) three-spool 100 MW aero-derivative engine model, intercooled and intercooled/recuperated engine cycles of the same 100 MW nominal power rating. In the analysis, design point and off-design performances of the engine models were established. The results indicate that to a large extent, the advanced engine cycles showed superior performance in terms of thermal efficiency, and fuel flow. In numerical terms, thermal efficiencies of intercooled engine cycle, and intercooled/recuperated engine cycles, over the simple cycle at design point increased by 2.42% and 0.94% respectively, whereas heat rates of these cycles over simple cycle at design point decreased by 2.37% and 0.93% respectively. It is worthy of note that for large-scale aero-derivative gas turbines having power rating of 100 MW and above, intercooled cycle would consume less fuel than intercooled-recuperated and simple cycles. This finding would actually aid good choice of cycle option for large-scale aero-derivative gas turbine designers, manufacturers and users.

Aero-Derivative-Gas-Turbines, Thermal-Efficiency, Intercooled-Recuperated, Fuel-Flow, Heat-Rate

Nkoi, B. and Isaiah, T. (2016) Advanced Cycles Large-Scale Aero-Derivative Gas Turbines: Performance Comparison. Journal of Power and Energy Engineering, 4, 7-19. doi: 10.4236/jpee.2016.45002.