Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Thermodynamic and Environmental Evaluation of Solid Oxide Electrolysis Cells for Green Hydrogen Production
Submission Author:
Diego Izidoro , MG , Brazil
Co-Authors:
Diego Izidoro, Silvio de Oliveira Junior
Presenter: Diego Izidoro
doi://10.26678/ABCM.COBEM2023.COB2023-1288
Abstract
Among the technological routes for green hydrogen production, high-temperature electrolysis (HTE) is more efficient than conventional electrolysis because it operates with reduced electrical potentials, resulting in a reduction in irreversibilities. However, since HTE is still under development, studies are necessary to evaluate its thermodynamic behavior and environmental impacts in different operating modes and with the use of different renewable energy sources to meet the electrical and thermal demands of the process. Therefore, this study aims to perform a thermodynamic and environmental evaluation of the process under different operating conditions. For that, a SOEC (solid oxide electrolysis cell) system model is developed and validated using experimental data from the literature. Subsequently, a methodology is applied for exergy and environmental assessment of the SOEC system to evaluate its performance and behavior under different temperatures, pressures, and steam molar conversion ratios (SC). For operation at the thermoneutral voltage at 800ºC, 1.013 bar, and SC of 0.7, the exergy efficiency obtained for the system is 90%. For the same conditions, the renewability exergy index was 8.99, assuming that all energy demand is met by renewable sources. Overall, this study demonstrates that SOEC systems can be a viable and sustainable technology to produce green hydrogen and the results can be applied in other analyses to determine the viability of the system for a wide range of applications.
Keywords
Environmental evaluation, Exergoeconomic analysis, high temperature electrolysis, Green Hydrogen, SOEC
