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Energies 2012, 5(3), 718-730; doi:10.3390/en5030718
Article

Exergy Assessment of Recovery Solutions from Dry and Moist Gas Available at Medium Temperature

1,* , 2
 and 1,3
Received: 3 February 2012; in revised form: 29 February 2012 / Accepted: 5 March 2012 / Published: 12 March 2012
Download PDF [574 KB, uploaded 12 March 2012]
Abstract: The Agence Nationale de la Recherche (ANR-EESI) ENERGY ReCOvery from Low Temperature heat sources (ENERCO_LT) project is a waste heat recovery project that aims to reduce energy consumption in industrial gas production sites, by producing electrical power from exothermic processes discharges at low and medium temperature. Two promising thermal sources, consisting of: (i) almost dry gas flow at 165 °C and (ii) moist gas flow at 150 °C with a dew point at 60 °C, were then investigated. In this paper, the challenge was to discern suitable recovery solutions facing resource specificities and their thermodynamic constraints, in order to minimize the overall exergy destruction, i.e., to move up the exergy efficiency of the entire system. In this spirit, different designs, including Organic Rankine Cycles (ORCs) and CO2 transcritical cycles, operating as simple and cascade cycles, were investigated. Combined exergy analysis and pinch optimization was performed to identify the potential of various working fluids, by their properties, to overcome the global irreversibility according to the studied resource. Supercritical parameters of various working fluids are investigated too, and seem to bring promising results regarding system performances.
Keywords: thermodynamic optimization; exergy; pinch; ORC; subcritical cycles; transcritical cycles; cascade thermodynamic optimization; exergy; pinch; ORC; subcritical cycles; transcritical cycles; cascade
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Ayachi, F.; Ksayer, E.B.; Neveu, P. Exergy Assessment of Recovery Solutions from Dry and Moist Gas Available at Medium Temperature. Energies 2012, 5, 718-730.

AMA Style

Ayachi F, Ksayer EB, Neveu P. Exergy Assessment of Recovery Solutions from Dry and Moist Gas Available at Medium Temperature. Energies. 2012; 5(3):718-730.

Chicago/Turabian Style

Ayachi, Fadhel; Ksayer, Elias Boulawz; Neveu, Pierre. 2012. "Exergy Assessment of Recovery Solutions from Dry and Moist Gas Available at Medium Temperature." Energies 5, no. 3: 718-730.


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