Effects of Evaporative Cooling on the Performance of a Gas Turbine Plant Operating in Bayelsa State,

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Author(s) Robert Poku | Ezenwa A. Ogbonnaya
Pages 476-482
Volume 4
Issue 8
Date August, 2014
Keywords Gas Turbine, Thermal Efficiency, Psychometric Chart, Wet Bulb Temperature, Evaporative Cooling, Combustion Turbine Inlet Air Cooling (CTIAC).

Abstract

A location where the demand for electricity is very high with warm weather, Performance of gas turbine plants is greatly affected. Therefore, to enhance the performance, inlet air cooling becomes necessary. This paper takes an in-depth study of the influence of an evaporative cooler on turbine inlet air and how the turbine responds to the reduced ambient temperature. In this study, a set of actual operational conditions such as ambient temperature and relative humidity were employed to determine the compressor work, turbine net work, specific fuel consumption and the thermal efficiency of the plant. A GT plant located in Bayelsa State, Nigeria that generates electricity was used as a case study for this research. The results showed that as the ambient temperature was lowered, the compressor work reduces, turbine network increases, specific fuel consumption reduces while the efficiency of the plant increases. It was observed that the effect of the evaporative cooling is that a drop in ambient temperature of 2.4°C leads to an increase of about 0.14% and 2.02kJ/kg in efficiency and network of turbine respectively and also, 0.002kg/KWh drop in specific fuel consumption. The research shows that gas turbine plants perform better in temperate regions than tropical. Therefore, to increase the performance of an existing gas turbine plants in high temperature climates, retrofitting an air cooler that will always reduce the temperature back or close to the design temperature before compression is necessary.

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