ENERGY AND EXERGY ANALYSIS OF A 250MW COAL FIRED THERMAL POWER PLANT AT DIFFERENT LOADS

Soupayan Mitra, Joydip Ghosh

Abstract: In this present investigation exergy and energy efficiencies of a coal fired 250 MW thermal power plant operating in eastern part of India are determined both for 100% and 90% load based on actual operating data. The efficiencies are evaluated for the overall plant as well as for different equipments like boiler, turbine, all feed water heaters and condenser. Similarly effectiveness of the feed water heaters is evaluated for both the loads. Exergy destruction % for each of the equipment are also given for clear understandingof the loss of available energy due to irreversibilities involved in the processes for each equipment and the whole plant. It is observed that a major irreversibility or, exergy destruction takes place at boiler though 1st law energy efficiency is quite high. This signifies that there might have further scope of improvement in this equipment. Similar analyses are carried out for other equipments. The results obtained in present analysis are compared with those of other investigators.

Keywords: Energy, Exergy, Efficiency, Effectiveness, Exergy destruction, Power plant

DOI: https://doi.org/10.15623/ijret.2015.0407009