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All Journal International Journal of Applied Power Engineering (IJAPE)
Leal, Elisângela Martins
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Electrical & Electronics Engineering

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Hybrid molten carbonate fuel cell and gas turbine cycle: technical analysis Leal, Elisângela Martins
International Journal of Applied Power Engineering (IJAPE) Vol 10, No 1: March 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijape.v10.i1.pp%p

Abstract

Hybrid systems that includes the use of fuel cells and thermal engines have been proposed and studied with promising results. Molten carbonate fuel cells (MCFC) present numerous advantages compatible with the current demands for the energy production in a sustainable and commercially competitive way. However, MCFC susceptibility to the deterioration of its components implies a reduced useful lifetime, being an obstacle to the potential of its economic attractiveness. This paper presents a technical analysis of the main variables on the energy efficiency and power generation of a hybrid system comprised of a molten carbonate fuel cell and a gas turbine through the determination of fuel cell design points and subsequent hybrid system modeling. Results indicate that the increase in temperature and in operating pressure of the fuel cell as well as the fuel reform rate improves the performance of the hybrid system as a whole. Variation in the utilization factor, however, did not determine an expressive increase in the system efficiency.
Technical analysis of a hybrid solid oxide fuel cell/gas turbine cycle Leal, Elisângela Martins; Bortolaia, Luís Antônio; Junior, Amauri Menezes Leal
International Journal of Applied Power Engineering (IJAPE) Vol 10, No 1: March 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijape.v10.i1.pp%p

Abstract

This paper shows a technical analysis of a direct internal reforming solid oxide fuel cell (DIR-SOFC) and a gas turbine (GT) system. The technical analysis consists of an energy and exergy analysis of the system. Equilibrium calculations are made to find the ranges of inlet steam/fuel ratio and the operational current density of the fuel cell. After that, a hybrid system consists of a DIR-SOFC and a GT is evaluated using a computer simulation at the design point. The results showed that the fuel cell is the main power producer system, the high energy efficiency (around 62%) and exergy efficiency (around 58%) is achieved by the hybrid cycle compared to fuel cell efficiency (about 40%) and the gas turbine (around 38%). The power ratio of the fuel cell / gas turbine was 1.50. An analysis varying the fuel cell current density and the gas turbine pressure ratio was performed showing that the fuel cell power production decreases with increasing current density when the gas turbine becomes the main power producing equipment. However, the system energy efficiency decreases with the reduction of power produced by the fuel cell. Finally, it is shown that the computer simulation of the hybrid system may represent a quick and economic feasible way to investigate it.
Co-Authors Bortolaia, Luís Antônio Junior, Amauri Menezes Leal