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ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
STUDY OF A HYBRID CYCLE WITH A HIGH-TEMPERATURE FUEL CELL AND A THERMAL ENGINE
Submission Author:
Davi Vieira , MG , Brazil
Co-Authors:
Davi Vieira, Elisangela Leal
Presenter: Davi Vieira
doi://10.26678/ABCM.ENCIT2022.CIT22-0334
Abstract
In the last years, the 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. System studies indicate that fuel cell/gas turbine hybrid system could realize a 25 percent increase in efficiency compared to the fuel cell alone. The synergy between the fuel cell and a thermal engine derives primarily from the use of the rejected thermal energy and the fuel from a fuel cell to drive the thermal engine. This paper shows an energy and exergy analyses of a solid oxide fuel cell (SOFC) coupled to a gas turbine (GT) hybrid system varying the location of the reforming system. The hybrid system is evaluated using a computer simulation at the design point. The methodology consists of describing and detailing the main components of the hybrid cycle, such as the fuel cell, gas turbine, and reformer. The fuel cell modeling consists of determining its theoretical reversible voltage, and subtracting from it the polarization losses due to ohmic drop, concentration and activation, of each of its components. The objective of this modeling is to verify the behavior of the device at the design point and off-design point and the influence in the hybrid cycle. The reforming modeling uses equilibrium calculations to find the ranges of the inlet steam/fuel ratio in order to increase the performance of the system. The gas turbine modeling is divided into parts, according to its main constituent elements. The determination of the operating parameters occurs by applying the laws of thermodynamics. Cycle-Tempo software is used to perform the simulation of the cycle, allowing the application in terms of numerical and data analyses. After the simulation, the results are compared to those of the literature. The results showed the technical feasibility of the system.
Keywords
Solid Oxide Fuel Cell, Gas Turbine, Hybrid System, Energy Analysis, exergy analys
