Banca de QUALIFICAÇÃO: REBECCA ARAÚJO BARROS DO NASCIMENTO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : REBECCA ARAÚJO BARROS DO NASCIMENTO
DATA : 26/03/2019
HORA: 11:00
LOCAL: Auditório do LABTAM - NUPPRAR
TÍTULO:

EVALUATION OF IRON AND MANGANESE ORE OF BRAZIL AS OXYGEN CONVEYORS FOR USE IN COMBUSTION PROCESSES WITH CHEMICAL RECIRCULATION

PALAVRAS-CHAVES:

Greenhouse effect, CO2 capture, CLC, Iron Ore, Manganese Ore

PÁGINAS: 90
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
RESUMO:

The greenhouse effect is a natural and essential process for sustaining life on earth, however, since the pre-industrial era, anthropogenic emissions of greenhouse gases (GHGs) have increased in large part by economic and population growth. In this context, the growing energy demand is mainly supplied by fossil fuels, resulting in a scenario of significant impacts on the environment, since the burning of these fuels for the generation of energy produces CO2, which is considered the main gas of anthropogenic origin more aggravating this It is made. Because of this, researchers around the world have suggested measures and technologies that meet the energy needs with low levels of CO2 emissions. Among the technologies, the Chemical Looping Combustion (CLC) process, which promotes indirect fuel combustion through oxygen carriers, is considered one of the best alternatives to reduce costs in capturing carbon dioxide without energy penalties. In view of this, this dissertation aims to evaluate iron and manganese ores from different regions of Brazil to select the most promising ones to be applied in CLC processes. The techniques and methodologies used were X-ray diffraction (XRD), reduction and oxidation at programmed temperature (RTP and OTP), oxygen transport capacity (Roc), fracture resistance, X-ray fluorescence (FRX) and reactivity by thermogravimetry. The chemical composition of each ore was obtained by FRX. Through DRX the main reactive phases were identified as Fe2O3 for iron ores and Mn3O4 for manganese ores. During the TPR and TPO analysis, these active phases were submitted, respectively, to the atmosphere of H2 and later to synthetic air and presented good reduction and oxidation capacity. Through the consumption of H2 used to reduce each phase, the experimental Roc of the oxygen transporters was calculated. Due to the structural characteristics and the reactivity tests of these materials, it was concluded that iron ores had better reactivity compared to manganese ores, in addition to their high mechanical strength when used in natura. Therefore, due to the abundance of iron ore in Brazil and its low cost, it is possible to infer them as promising materials for application in CLC processes.

MEMBROS DA BANCA:
Presidente - 349770 - DULCE MARIA DE ARAUJO MELO
Externo ao Programa - 2302898 - ELEDIR VITOR SOBRINHO
Externa ao Programa - 1979301 - RENATA MARTINS BRAGA
Externo à Instituição - RODOLFO LUIZ BEZERRA DE ARAÚJO MEDEIROS - UFRN