Banca de QUALIFICAÇÃO: CLEYDSON TIAGO FERREIRA RUFINO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : CLEYDSON TIAGO FERREIRA RUFINO
DATE: 27/09/2024
TIME: 09:00
LOCAL: sala 414 CTEC e via Meet
TITLE:

Energy, Exergy, Exergoeconomic and Exergoenvironmental Studies (4E) of Green Hydrogen Production in Solid Oxide Electrolyzers (SOEC)

KEY WORDS:

Heliostats, photovoltaic panel, battery bank, cost, environmental impact

PAGES: 109
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUBÁREA: Engenharia Térmica
SPECIALTY: Aproveitamento da Energia
SUMMARY:

The increase in global energy demand and the use of fossil fuels are factors that encourage global warming. Reducing greenhouse gas (GHG) emissions and using clean energy sources improves economies and global energy security. The use of green hydrogen as an energy vector is one of the actions in the search for the decarbonization of the planet. Electrolyzer cells are the most widely used worldwide to produce hydrogen from water. The solid oxide cell has the highest efficiency among them, but its disadvantage is the operating temperature range between 600 and 1000°C. The general objective of this dissertation is to develop the exergy, exergoeconomic and exergoenvironmental analysis of a green hydrogen production system driven by the solid oxide electrolysis cell (SOEC). The system has 60 electrolyzer modules with a capacity of 1.88 kg/h of hydrogen per module, with a total capacity of 112.8 kg/h. Each module consumes 16.79 kg/h of water. The solar field supplies a constant heat rate of 873 kW with 3307 Heliostats. Each module is supplied with 52.17 kW of electricity through 163 photovoltaic panels with 76 batteries of 220 Ah and 12 Volts. The cell operates at 950°C with a current density of 2500 A/m2 and a voltage of 1.043 V. Its overall energy efficiency is 93.97%. The largest relative error of the model was 2.75% to estimate the voltage. The lowest exergy efficiencies were in the solar field at 18.48% and in heat exchanger #2 at 24.43%. The molten salt storage system and the batteries allow the cells to operate in a 9-hour period from 9 am to 6 pm. The total acquisition cost of the equipment was 28.05 MUS$. The highest system costs were: The solar tower field and Heliostats of 13.42 MUS$, followed by the set of photovoltaic panels and battery bank of 12.51 MUS$ and in third place the electrolyzing cells of 2.056 MUS$. The cost of hydrogen is 84.26 US$/GJ or 9.953 US$/kg or 0.8948 US$/m3. The cost of electricity produced in the panels with batteries was 46.13 US$/GJ or 0.1660 US$/kWh. The component with the worst performance from an Exergoeconomic point of view is the set of photovoltaic panels with batteries with the highest exergy destruction rate of 39.41 US$/h and Exergoeconomic factor of 18.02%. The component with the lowest value of the exergoeconomic factor is the heat exchanger #1 with f = 3.42%. The component with the greatest potential for improvement with the least effort is the solar tower and heliostat field, whose relative cost difference is 1975.0.

COMMITTEE MEMBERS:
Presidente - 1753416 - EDUARDO JOSÉ CIDADE CAVALCANTI
Interno - 3254216 - ALVARO AUGUSTO SOARES LIMA
Externo à Instituição - THIAGO DE OLIVEIRA MACEDO - CEFET/RJ