Estimation of exergy-based sustainability index and performance evaluation of a novel intercooled hybrid gas turbine system |
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Affiliation: | 1. Department of Mechanical Engineering, PDPM Indian Institute of Information and Technology, Design and Manufacturing, Jabalpur, M.P, 482005, India;2. Department of Mechanical Engineering, NIT Jamshedpur, Jharkhand, 831014, India |
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Abstract: | This paper contributes a novel sustainability index and modified exergy indicators for conventional gas turbines and solid oxide fuel cell integrated gas turbine (SOFC-GT) hybrid power cycles. In this work, an intercooled gas turbine (Ic-GT) cycle is considered as a base cycle, which gives an additive advantage in lowering the power required for the compressor. Moreover, on SOFC integration with Ic-GT, the qualitative and quantitative performance are examined. Numerical modeling is done using MATLAB and an exclusive comparison has been made based on energy-exergy and sustainability analysis for the system and its components. On comparing the first law efficiency at turbine inlet temperature, TIT 1250K and rp = 18 for Ic-GT, intercooled recuperated gas turbine (Ic-RGT), and Ic–SOFC–RGT, it is 25.82%, 36.04%, and 64.78%, respectively. Similarly, second law efficiency is 11.43%, 22.33%, and 61.11% and the overall sustainability index is 1.12, 1.28, and 2.57 for Ic-GT, Ic-RGT, and Ic–SOFC–RGT, respectively. Nine other modified exergy-based parameters are used to identify the role of fuel and product exergy and then compare the most affected component in three configurations. |
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Keywords: | Intercooled gas-turbine Recuperated gas-turbine Energy-exergy analysis Hybrid power cycle Sustainability index |
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