Energy and exergy analyses of five conventional liquefied natural gas processes |
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Authors: | Ali Vatani Mehdi Mehrpooya Ali Palizdar |
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Affiliation: | 1. School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Department of Renewable Energies and Environmental, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran |
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Abstract: | In this paper, five conventional LNG processes were investigated by energy and exergy analysis methods. On the basis of the energy analysis, three‐stage process of Linde AG and Stat oil (mixed fluid cascade [MFC]) has less energy consumption than the other ones (0.254 kWh/kg liquefied natural gas). Also, coefficient of performance of the cycles of this process is higher compared with the other ones. Exergy analysis results showed that the maximum exergy efficiency is related to the MFC process (51.82%). However, performance of the MFC process in terms of quality and quantity of energy consumption is considerable. But using three cycles in this process needs more components and consequently more fixed costs. In this study, sensitivity of coefficient of performance, specific energy consumption, and indexes of exergy analysis were also analyzed versus important operating variables for all cases. Copyright © 2014 John Wiley & Sons, Ltd. |
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Keywords: | natural gas liquefaction mixed refrigerant efficiency exergy |
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