THE EXERGY ANALYSIS AND OPTIMIZATION ON 815 MW SUPERCRITICAL STEAM POWER PLANT PAITON, INDONESIA

Abstract

The exergy analysis of supercritical steam power plant system at unit 3 Paitoon was carried out based on the first and second thermodynamic laws. The exergy flow and exergetic efficiency are calculated for each generator component including boiler, HTP, IPT, LPT, deaerator, condenser, HPH, LPH, CEP and FWP. The steam exergy flowing into the system is 970288 kW which is used to produce 815 MW of electricity with the overall exergy efficiency of the plant is 26.32%. Sankey diagram shows the loss of exergy in each component of the power plant. Irreversibilities in boilers, condensers, turbines, LPH, HPH, pumps and daerators are 1041068.79 kW (18.87%), 400619.99 kW (7.28%), 891940.73 kW (16.17%), 41511.13 kW (0.75%), 59977.63 kW (7.28%) (1.09%), 10815.02 kW (0.20%) and 4745.18 kW (0.09%) and the total exergy that can be converted into electrical energy is 3097083.84 kW (55.96%) of the total exergy that enters the system. The greatest irreversibility was found in boilers in the amount of 1677003 kW (17.28%). Based on the results of optimization carried out by varying the output pressure, the boiler obtained the highest efficiency value of 61.20% at an output pressure of 24.53 bar.