Simulation For Performance Improvement of Omotosho Power Plant Using Inlet Air Cooler and Heat Recovery Steam Generation (HRSG) System

Abstract

In this study Omotosho gas turbine plant was modified into three different configurations by incorporating Inlet air cooler and Heat Recovery Steam Generator (HRSG). The reason for the modification is to improve its performance. Aspen Hysys software was used to simulate both the simple (Omotosho) and the three modified gas turbine plants. The results reviews that the three modified gas turbine plants has higher thermal efficiency compare to the Omotosho gas turbine plant. There is thermal efficiency increase from 34.94% for the Omotosho gas turbine to 47.44%, 43.93% and 45.21% for the first, second and third modifications respectively. Also, there was increase in the power output from 114 MW for the Omotosho gas turbine to 157 MW, 143 MW and 147 MW for the first, second and third modifications respectively. The higher thermal efficiency of the modified gas turbine plants leads to specific fuel consumption reduction from 0.2116 kg/kWh for the Omotosho gas turbine to 0.1136 kg/kWh, 0.1683 kg/kWh and 0.1611 kg/kWh for the first, second and third modifications respectively. The reduction in the specific fuel consumption in the three modified gas turbine also lead to reduction of heat rate from 10304.27 kJ/kWh for the Omotosho gas turbine to 7588.89 kJ/kWh, 8195.51 kJ/kWh and 7963.43 kJ/kWh for the first, second and third modifications respectively. The emission rate of the three modified gas turbine plants are lower than that of the Omotosho plant thereby leading to reduction in global warming and ozone layer depletion. It was observed that the first modification has the highest overall performance, followed by the third modification then finally the second.

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