Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
THERMODINAMIC STUDY OF A HYBRID SOLID OXIDE FUEL CELL AND A GAS TURBINE CYCLE
Submission Author:
Tássio Marques Rios , MG , Brazil
Co-Authors:
Elisangela Leal, Luís Antônio Bortolaia, julio campos
Presenter: Tássio Marques Rios
doi://10.26678/ABCM.ENCIT2016.CIT2016-0133
Abstract
In the last 10 years, research and development activities in fuel cell technology have been intensified within industry, research institutes and universities. As a result, fuel cells are now moving towards commercial readiness, or expecting a breakthrough within the next few years. The electricity production market benefits from combined or hybrid cycles because of their high efficiency. In this scenario, fuel cells are a good candidate combined to gas turbines. Systems studies indicate that fuel cell/turbine hybrid system could realize a 25 percent increase in efficiency for a comparably sized fuel cell. The synergy realized by fuel cell/turbine hybrid system derives primarily from the use of rejected thermal energy and combustion of residual fuel from a fuel cell to drive the gas turbine. High temperature fuel cells offer good opportunities for coupling with a gas turbine. This type of fuel cell allow conversion of a wide range of fuels, including various hydrocarbon fuels. The relatively high operating temperature allows for highly efficient conversion to power, internal reforming, and high quality by-product heat for cogeneration or for use in a bottoming cycle. Fuel cell systems have demonstrated minimal air pollutant emissions and low greenhouse gas emissions. This paper presents a thermodynamic analysis of a direct internal reforming solid oxide fuel cell (DIR-SOFC) and a gas turbine (GT) system. Equilibrium calculations are performed to find the ranges of inlet steam/fuel ratio. After that, a hybrid system with a DIR-SOFC and a GT is evaluated using a computer simulation in the design point. The results showed that the fuel cell is the main energy producer system. Also, the high net efficiency (76%) is achieved by the hybrid cycle compared to fuel cell efficiency of about 48% and the gas turbine around 37%. Finally, it is shown that the computer simulation of the hybrid system may represent a quick and economic feasible way to investigate it.
Keywords
Solid Oxide Fuel Cell, Gas Turbine, Hybrid System, Energy Analysis
