A Distributed Generation Hybrid System for Electric Energy Boosting Fueled with Olive Industry Wastes

David Vera, Francisco Jurado, Bárbara de Mena and Jesús C. Hernández
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David Vera: Department of Electrical Engineering, Escuela Politécnica Superior, University of Jaén, 23700 Linares, Spain
Francisco Jurado: Department of Electrical Engineering, Escuela Politécnica Superior, University of Jaén, 23700 Linares, Spain
Bárbara de Mena: Department of Electrical Engineering, Escuela Politécnica Superior, University of Jaén, 23700 Linares, Spain
Jesús C. Hernández: Department of Electrical Engineering, Escuela Politécnica Superior, University of Jaén, 23700 Linares, Spain

Energies, 2019, vol. 12, issue 3, 1-18

Abstract: This paper presents the theoretical model and the simulation of a cutting edge hybrid power system composed of an externally-fired gas turbine (EFGT) coupled with an organic Rankine cycle (ORC) as a bottoming unit for the maximization of electrical power. The power plant is fed with different biomass sources from olive industry wastes (pruning, dry pomace, stones, leaves and twigs), providing more than 550 kW of electric power and a net electrical efficiency of 26.0%. These wastes were burnt directly at atmospheric pressure in an EFGT, producing 400 kW of electric power and exhaust gases at 300 °C. Ten suitable ORC working fluids have been studied to maximize the electric power generation: cyclohexane, isohexane, pentane, isopentane, neopentane, R113, R245fa, R365mfc, R1233zd and methanol. The best fluid was R1233zd, reaching 152.4 kW and 22.1% of ORC thermal efficiency; as drawback, however, R1233zd was not suitable for Combined Heat and Power CHP applications due its lower condensation temperature. Thus, despite R113 gave minor electricity production (137.5 kW) this allowed to generate additional thermal power (506.8 kW) in the way of hot water at 45 °C.

Keywords: biomass; olive oil industry; externally fired gas turbine; organic Rankine cycle; optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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