Abstract
Two of the most prominent techniques to improve energy conversion efficiency of a gas turbine-based combined heat and power plant are the use of “recuperation” and “cogeneration”. Thermodynamic and environmental analysis of this type of cycle has been reported in the article. Exergy analysis of the proposed recuperated gas turbine–triple pressure Rankine combined cycle has been presented in comparison with traditional basic gas turbine-based combined cycle. Analysis of emission of oxides of nitrogen from power plant based on the proposed cycle has been carried out to estimate its environmental impact. The results of exergy analysis show a higher gas turbine rational efficiency = 37.32% in case of recuperated gas turbine-combined cycle as compared to 34.41% for basic gas turbine-combined cycle configuration due to a relative decrease in fuel requirement. Results also show that power-to-heat ratio and cogeneration energy efficiency of recuperated gas turbine cogeneration configuration is 0.8246 and 56.28% respectively, while cogeneration exergy efficiency for basic gas turbine-based cycle has been found to be 47.67% and power-to-heat ratio is 0.6749. Emission of oxides of nitrogen from the proposed cycle has been observed to increase with increase in compression pressure ratio and has been found to be around 5.30 g/kg of fuel at compressor pressure ratio of 23.
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