Energy and exergy analysis and optimization of Kalina cycle coupled with a coal fired steam power plant

► KCS11 can be efficiently coupled with steam power plant for exhaust heat recovery. ► In the Kalina bottoming cycle, maximum exergy destruction is found in evaporator. ► There is an optimum ammonia fraction at each pressure that gives best performance. ► At a moderate pressure of around 4000 kPa, optimum ammonia mass fraction is 0.8. ► A flue gas desulphurization unit and Teflon coating required in coal fired plants.