Exergy Modelling of a Coal Based 210 MW Thermal Power Plant working under varying Load Conditions

Abstract

In the present work, exergy analysis of a coal-based thermal power plant is done using the operating data of a
210MW thermal power plant under operation in eastern region of India. The entire power plant cycle is split up into ten
thermal components for the analysis in order to analyze and compare the exergy destruction, % exergy destruction and
second law efficiencies of the system and their components at full load as well as at part load conditions. The above analyses
were carried out at 100%, 75% and 60% of operating load to investigate the performance of the total power cycle and their
constituting components in order to obtain the sources and causes of irreversibility’s as well as the variations in exergy
efficiency under different operating conditions. It has been observed that the boiler causes the maximum exergy destruction
at all loads under study. The contribution of the deaerator comes next followed by turbine and condenser while the
contribution of the feed water heaters and pumps is the least among the selected components.