Performance Simulation of Combined Cycle with Kalina Bottoming Cycle

Abstract

The Kalina cycle has potential for improved performance re-garding electrical ef ficiency, specific power output and cost of electricitycompared with conventional technology because the mixture of workingfluids enables ef ficient energy recovery. Thermodynamic analysis hasbeen carried out for combined cycle with the Kalina bottoming cycle.In this work, the identi fied key parameters for the Kalina cycle are tur-bine inlet condition (pressure, temperature and concentration), separatortemperature and ambient temperature. The effect of these parameters onexergy ef ficiency of combined cycle is examined. The combined cycleefficiency increases with the increase in the turbine inlet pressure, andthe same decreases with increases in ambient temperature, turbine inlettemperature and its concentration. Heat recovery from exhaust decreaseswith increases in the separator temperature, and it does not alter theoutput of the combined cycle. The ef ficiency of the cycle is very sensi-tive to the turbine inlet concentration and ambient temperature.