Abstract
AbstractIn this study, exergy costing analysis and performance evaluation of selected gas turbine power plants in Nigeria are carried out. The results of exergy analysis confirmed that the combustion chamber is the most exergy destructive component compared to other cycle components. The exergetic efficiency of the plants was found to depend significantly on a change in gas turbine inlet temperature (GTIT). The increase in exergetic efficiency with the increase in turbine inlet temperature is limited by turbine material temperature limit. This was observed from the plant efficiency defect curve. As the turbine inlet temperature increases, the plant efficiency defect decreases to minimum value at certain GTIT (1,200 K), after which it increases with GTIT. This shows degradation in performance of gas turbine plant at high turbine inlet temperature. Exergy costing analysis shows that the combustion chamber has the greatest cost of exergy destruction compared to other components. Increasing the GTIT, both the...
Highlights
Energy is the keystone of life and prosperity
Cooling compressor inlet air allows the compression of more air per cycle, effectively increasing the gas turbine capacity
In the present study, exergy costing analysis and performance assessment from thermodynamics point of view were performed for 11 selected gas turbine power plants in Nigeria
Summary
Energy is the keystone of life and prosperity. The continued development and application of energy are essential to the sustainable advancement of society. It is possible to evaluate the performance of energy conversion processes on a thermodynamics basis, and by including economic and environmental aspects and impacts of the studied processes. This comprehensive approach of the energy resources utilization has, as one of the most important features, the identification of sustainable ways of energy resources utilization (Silvio, 2013). The exergy analysis provides means to evaluate the degradation of energy during a process, the entropy generation, and loss of opportunities to do work and offer space for improvement of power plant performance. This method allows evaluation of costs caused by irreversibility which may include the investment and operating cost of each component (Ibrahim bin, Masrul, Mohd Zamri, & Mobd, 2001)
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