Energy, exergy, environmental and thermoeconomic analysis of combined cycle power plant using modified guide vane and inlet air fogging systems

In the present study, the energy, exergy, environmental, and economic (4-E) analyses of Rajai's combined cycle power plant with applying environmentally friendly technologies have been performed. To this end, three scenarios have been considered: (1) without auxiliary systems; (2) with modified guide vane system; (3) integrated guide vane system and inlet air fogging. The angle was increased from 84 degrees to 86 degrees to modify the guide vane opening angle of the compressor. Besides, inlet air fogging is used to reduce the compressor's inlet temperature. The results show that the highest exergy destruction (($) over tilde 34%) occurred in the combustion chamber. The corresponding values for HRSG and gas turbine are 21% and 26%, respectively. With a modified guide vane system, scenario 2, the cycle's first law efficiency is enhanced by 0.56% compared to scenario 1. In addition, in scenario 3, the second law efficiency increased by 0.67%, and the exergy destruction decreased by 0.85%. By using the proposed system, an increased income of hi.85 per megawatt-hour was gained. Regarding the CO2 emission and fuel consumption, a reduction of 1.65% and 1150m3=h was observed.

Automated summary

In this study, the energy, exergy, environmental, and economic analyses of Rajai's combined cycle power plant with environmentally friendly technologies were conducted. The results showed that modifying the guide vane system and using inlet air fogging can improve the plant's efficiency and income, while reducing CO2 emissions and fuel consumption.