Abstract
By consolidating the principles of both first and second laws of thermodynamics, exergy-based analyses have demonstrated their potential for evaluating the efficiency, productivity, and sustainability of various biofuel production systems including biogas. Exergy-based approaches have been extensively applied in biofuel industry for finding the most thermodynamically, economically, and environmentally sound production, upgrading, refining, and utilization systems. In this chapter, after briefly explaining the concept of exergy, a case study on the application of advanced exergy and exergoeconomic analyses for evaluating two biogas upgrading processes, i.e., high pressure water scrubbing (HPWS) and cryogenic separation (CS) was presented and discussed. According to the results obtained, endogenous exergy destruction and investments costs of most of the elements of both biogas upgrading processes were higher than their corresponding exogenous counterparts, showing a weak economic correlation among those elements. Exergy destruction and investment costs associated with compressors and pumps were avoidable and unavoidable, respectively. While, exergy destruction and investment costs related to heat exchangers and air coolers were found to be unavoidable and avoidable, respectively. Finally, three different strategies were suggested for discounting costs and improving the process performance.
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Ansarinasab, H., Mehrpooya, M. (2018). Exergy-Based Performance Assessment of Biogas Plants: Application of Advanced Exergy and Exergoeconomic Analyses for Evaluating Biogas Upgrading Process. In: Tabatabaei, M., Ghanavati, H. (eds) Biogas. Biofuel and Biorefinery Technologies, vol 6. Springer, Cham. https://doi.org/10.1007/978-3-319-77335-3_14
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DOI: https://doi.org/10.1007/978-3-319-77335-3_14
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