Enhancing the thermal performance of the gas turbine unit in Kelanitissa combined cycle power plant using inlet air evaporative coolers

Abstract

This project report presents a study on the potential benefits of using an evaporative cooling system to reduce the temperature of the air entering the gas turbine at the Kelanitissa Combined Cycle Power Plant in Sri Lanka. The study was motivated by the fact that the plant's capacity is reduced during periods of high ambient temperature due to the decrease in air density and mass flow rate to the gas turbine. The study began with a literature survey on gas turbine inlet air cooling methods, advantages and disadvantages, theoretical background, and gas turbine operation. Next, field measurements and historical data were obtained to develop a relationship between ambient temperature and turbine performance. Energy calculations were then performed to determine the required level of inlet air temperature and to select a suitable evaporative cooler. Finally, a technical and economic feasibility study of the system was conducted. The study found that an evaporative cooling system has the potential to significantly improve the thermal performance of the Kelanitissa Combined Cycle Power Plant. By reducing the temperature of the air entering the gas turbine, the system can increase power output, improve thermal efficiency, and reduce fuel consumption. Additionally, the system is cost-effective and has a relatively short payback period. Based on the findings of the study, it is recommended that an evaporative cooling system be installed at the Kelanitissa Combined Cycle Power Plant. The system would provide significant benefits to the plant and the country as a whole, including increased power generation capacity, improved efficiency, reduced fuel consumption, and lower emissions