Exergy Assessment of Recovery Solutions from Dry and Moist Gas Available at Medium TemperatureReport as inadecuate


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


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1

PROMES PROcédés, Matériaux et Energie Solaire—CNRS Centre National de la Recherche Scientifique, Tecnosud Rambla de la thermodynamique, Perpignan 66100, France

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CEP MINES Paris-Tech Centre Energétique et Procédés, 5 rue Léon Blum, Palaiseau 91120, France

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Université de Perpignan Via Domitia, 52 avenue Paul Alduy, Perpignan 66860, France





*

Author to whom correspondence should be addressed.



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. View Full-Text

Keywords: thermodynamic optimization; exergy; pinch; ORC; subcritical cycles; transcritical cycles; cascade thermodynamic optimization; exergy; pinch; ORC; subcritical cycles; transcritical cycles; cascade





Author: Fadhel Ayachi 1,* , Elias Boulawz Ksayer 2 and Pierre Neveu 1,3

Source: http://mdpi.com/



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