The investigation of increasing of the efficiency in the power plant with gas-solid fuels by exergy analysis

In this study the energy and exergy analysis have been applied to the power plant in the iron and steel works co. this plant consist of two parts,which could be described as old and new sections. these components work together as an integrated power plant. in this work,the irreversibility rates and energy losses of each units have been determined separately by energy and exergy analysis. also,units have been compared by irreversibility rates and some considerable suggestions have been made to improve efficiency. it is suggested to remove three pressure reduction units (pdd1,pdd2,pdd3),have a total irreversibility rate of 6054 kw,from the existing plant and replaced by a turbo-generator (tg4). calculated results showed that the increments of overall thermal ( or first law) efficiency and overall exergy (or second law) efficiency of suggested plant were 2.27 and 2.21 %,respectively. ©2008 tibtd printed in turkey.