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COBEM 2021
26th International Congress of Mechanical Engineering
ENERGY AND EXERGY ANALYSIS OF HYDROGEN PRODUCTION VIA HIGH-TEMPERATURE ELECTROLYSIS POWERED BY SOLAR AND WIND ENERGY
Submission Author:
Diego Izidoro , MG , Brazil
Co-Authors:
Diego Izidoro, Silvio de Oliveira Junior
Presenter: Diego Izidoro
doi://10.26678/ABCM.COBEM2021.COB2021-0368
Abstract
Due to its high availability and production flexibility, hydrogen is seen as a promising alternative as an energy vector, besides being a raw material of great importance in chemical industries. However, almost all of the hydrogen used in the world nowadays is produced from fossil fuels. Therefore, it is essential that routes of hydrogen production from renewable energy sources must be developed and prioritized. In this way, this study evaluates a high-temperature electrolysis (HTE) process powered by solar and wind energy for clean hydrogen production. For that, a plant using solid oxide electrolysis cells (SOEC) is proposed. A 10 MW wind farm is considered for supplying electricity and a solar tower system is considered to provide thermal energy to the plant. Due to its high solar and wind resources, Guamaré, a coastal city located in northeastern Brazil, was selected as a case study. Energy and exergy analyses were performed. For a daily operation of eight hours, the average electricity generation was estimated at 122.38 MWh per day and the solar energy needed for the heliostats was calculated at 44.50 MWh, that would be enough to produce 3.3 t/day of hydrogen. The electrolyzer achieved an exergy efficiency of 89.4% and the average exergy efficiency of the plant was 31.7%. The solar receiver and the heat exchangers were the components with the lowest exergy efficiencies values. From this study, it is possible to carry out other analyses to improve and optimize the system and determine its economic viability for sustainable hydrogen production.
Keywords
Exergy Analysis, high temperature electrolysis, Hydrogen Production, Solar Energy, wind energy
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