Energy and Exergy Analyses of Unit#2 of 50 MW of Lakhra Coal Power Plant (FBC) Jamshoro

In this study, exergy, and economic analyses of a unit of 50 MW of Lakhra steam coal power plant, situated near Jamshoro Pakistan is presented. Firstly, a thermodynamic model is developed using Engineering Equation Solver (EES) software and validated, followed by a parametric analysis to show the impacts of various operating parameters on the power plant performance. The condenser pressure, main steam pressure and temperature are selected as operating parameters while net power output, energy and exergy efficiencies are selected as performance parameters. The investigation under two conditions were performed; Designed and Off designed. Under designed parameters, the unit is simulated yielding 50.77 MW power output with 29.48% and 24.94 % energy and exergy efficiencies, respectively. While under off-designed conditions the unit yielded power output of 26.542 MW, with energy and exergy efficiencies of 20.83% and 17.62%. The component-level analysis shows condenser as a main contributor towards energy loss of 68.19% followed by boiler with energy loss of 24.7% while the latter plays a major role in the exergy destruction of the plant contributing of 93.84% (38.74 MW) out of total exergy destruction of 41.52 MW succeeded by feedwater heaters with exergy destruction of 2.94% (1.24 MW) and turbine with exergy destruction of 1.72% (0.71 MW) while the least exergy destruction happens in condenser. The first law efficiency of boiler, turbine, condenser is as 82.93%, 98.62% and 52.88 % respectively. While the second law efficiency of these components are as 67.2%, 94.89% and 94.89% respectively.