Applicability of Kalina cycle for waste heat recovery in themal power stations in Sri Lanaka

Abstract

Energy Crisis is the critical problem faced by the modern world. Day by day the impact is becoming severe with decaying of fossil fuels. Therefore, whole world has paid their attention on Non Conventional Renewable Energy sources. Industrial Waste Heat Recovery is one of them. The main focus of this thesis is to identify the best suited method for recovering lowgrade energy from thermal power stations in Sri Lanka. Among few methods, Kalina Cycle System is selected by concerning its viability for usage. Several attempts were made to assess the available heat energy from thermal power stations in Sri Lanka. The first objective of this research is to assess the thermal energy wasted from thermal power stations operating in Sri Lanka. The next objective was to identify the best suited configuration of Kalina Cycle System for extracting low-grade heat energy. The final objective was to use the said system for harnessing the energy, and quantify them. Simultaneously an economic analysis was carried out to assess its economic feasibility. A literature review was done to identify possibilities of harnessing the energy from flue gas of thermal power stations and to find out the suitable method for extracting energy.Lakvijaya Power Station and Kelanitissa Combined Cycle Power Station, which have emissions below 200oC, has the ability of generating electricity using the Kalina Cycle.However, as per the analysis, they are not economically feasible. However, with these results,it is suggested to continue the same exercise to other thermal power stations, which has high temperature flue gases. As the next step, it is proposed to identify the best suited Kalina Cycle System for the rest of thermal power stations and expand this exercise throughout CEB owned and private owned thermal power stations, using other suitable configurations of Kalina Cycle System.