Exergy, Exergoeconomic and Exergoenvironmental Analysis in Natural Gas Liquid Recovery Process

Document Type : Research Article


1 Department of Mechanical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, I.R. IRAN

2 Renewable Energies and Environmental Department, Faculty of New Science and Technologies, University of Tehran, Tehran, I.R. IRAN

3 Department of Mechanical Engineering, Petroleum University of Technology (PUT), Ahwaz, I.R. IRAN


In this work, the real case study of the energy quality of the natural gas liquid recovery plant 800 is evaluated via exergy, exergy economy, and exergy environmental methods. The corresponding simulation is carried out using Aspen HYSYS V10 software and Matlab. Sensitivity analysis will evaluate energy consumption, environmental impact, and the economics of inefficient equipment. The exergy analysis results show that the compressor (K103) and the heat exchanger (E101) with the highest exergy destruction are 510 and 629 kW, respectively. Improving the performance of these equipment can reduce exergy destruction and increase exergy efficiency. Furthermore, the results indicate that the main improvement priority belongs to the compressor (K103). According to the results of the exergoeconomic evaluation, the maximum value of the exergoeconomic factors belongs to the heat exchanger (E103). It should be replaced by a cheaper one. Furthermore, E100 and K102 have the potential for economic improvement in terms of their high exergy destruction and the relative cost difference. Furthermore, their low values of exergoeconomic factors show dominance in the exergy-related cost part. Improving the performance of these devices will significantly reduce the overall cost rate by up to 40%. The results show that the main improvement priority based on the exergoeconomic concept belongs to the compressor (K102). The highest value of the exergoenvironmental factor belongs to the heat exchanger (E-103) by 99%. This shows its high LCA environmental impact. The total impact rate may be reduced by up to 97 percent by optimizing the equipment's operating and maintenance parameters. Environmental results show that E101 and P100 have the potential for improvement. Improving the performance of these devices will significantly reduce the overall environmental impact by up to 40%. Furthermore, the main priority for improvements based on the exergoenvironmental concept belongs to the heat exchanger (E101).


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