EXERGY ANALYSIS OF DIFFERENT COMPONENTS OF STEAM POWER PLANT

Abstract

The increasing demand of power has made the power plants of scientific interest, but most of the power plants are designed by the energetic performance criteria based on first law of thermodynamics only. The real useful energy loss cannot be justified by the fist law of thermodynamics, because it does not differentiate between the quality and quantity of energy. Energy analysis presents only quantities result while exergy analysis presents qualitative results about actual energy consumption. In this analysis shows exergy efficiency is less at each and every point of unit equipment’s. Also presents major losses of available energy at combustor, superheater, economiser and air-pre heater section. This article shown energy, exergy efficiency, exergy destruction and energy losses comparison charts. The primary objective of this work is to analyse the system components separately and to identify and quantify the sites having largest energy and exergy losses at different load. A numerical code is established using EES software to perform the calculations required for the thermal and exergy plant analysis considering real variation ranges of the main operating para- meters such as pressure, temperature and mass flow rate. The effects of theses parameters on the system performances are investigated.