Thermodynamic Evaluation of the Performance of a Combined Cycle Power Plant

A clean and safe energy is the greatest challenge to meet the requirements of green environment. These requirements given way the long time governing authority of steam turbine (ST) in the world power generation, and gas turbine (GT) and its combined cycle (CCGT) will replace it. Therefore, it is necessary to predict the characteristics of the CCGT system and modeling its operating parameters by developing a simulation system. Increases the cycle peak temperature ratio and peak compression ratio have been proposed for improving the combined-cycle gas-turbine performance. The code of the performance model for CCGT power plant was developed utilizing the MATLAB software. The results from this simulation present that the combined cycle CCGT has the high overall thermal efficiency of 58% with an increase of the peak compression ratio and cycle peak temperature ratio of 24 and 5.3 respectively. The total power output increases with an increase of cycle peak temperature ratio and decrease of the compression ratio. The peak overall efficiency occurs at the higher compression ratio with low ambient temperature and higher turbine inlet temperature, while, the overall thermal efficiencies for CCGT are higher compared to the thermal efficiencies of the gas turbine and steam turbine power plants. Thus, it can be understood that the models developed in this study are useful tools for estimation of the CCGT power plant’s performance.

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