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Entropy 2016, 18(9), 314; doi:10.3390/e18090314

Exergy Analysis of a Syngas-Fueled Combined Cycle with Chemical-Looping Combustion and CO2 Sequestration

Department of Energy Engineering, ETSII, Technical University of Madrid, José Gutiérrez Abascal 2, 28006 Madrid, Spain
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Academic Editor: Dawn E. Holmes
Received: 30 May 2016 / Revised: 29 July 2016 / Accepted: 17 August 2016 / Published: 25 August 2016
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Abstract

Fossil fuels are still widely used for power generation. Nevertheless, it is possible to attain a short- and medium-term substantial reduction of greenhouse gas emissions to the atmosphere through a sequestration of the CO2 produced in fuels’ oxidation. The chemical-looping combustion (CLC) technique is based on a chemical intermediate agent, which gets oxidized in an air reactor and is then conducted to a separated fuel reactor, where it oxidizes the fuel in turn. Thus, the oxidation products CO2 and H2O are obtained in an output flow in which the only non-condensable gas is CO2, allowing the subsequent sequestration of CO2 without an energy penalty. Furthermore, with shrewd configurations, a lower exergy destruction in the combustion chemical transformation can be achieved. This paper focus on a second law analysis of a CLC combined cycle power plant with CO2 sequestration using syngas from coal and biomass gasification as fuel. The key thermodynamic parameters are optimized via the exergy method. The proposed power plant configuration is compared with a similar gas turbine system with a conventional combustion, finding a notable increase of the power plant efficiency. Furthermore, the influence of syngas composition on the results is investigated by considering different H2-content fuels. View Full-Text
Keywords: chemical-looping combustion; exergy analysis; second law efficiency; efficient system for power generation; carbon capture and storage; gas turbine system; synthesis gas chemical-looping combustion; exergy analysis; second law efficiency; efficient system for power generation; carbon capture and storage; gas turbine system; synthesis gas
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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. (CC BY 4.0).

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Urdiales Montesino, Á.; Jiménez Álvaro, Á.; Rodríguez Martín, J.; Nieto Carlier, R. Exergy Analysis of a Syngas-Fueled Combined Cycle with Chemical-Looping Combustion and CO2 Sequestration. Entropy 2016, 18, 314.

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