Banca de QUALIFICAÇÃO: MAYARA DE OLIVEIRA LESSA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : MAYARA DE OLIVEIRA LESSA
DATE: 22/11/2019
TIME: 14:00
LOCAL: AUDITÓRIO PPGEQ
TITLE:

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KEY WORDS:

Energetic characterization, Elephant grass, Thermal degradation, Flash pyrolysis, Kinetic Study, Energy crop.

PAGES: 80
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

Elephant Grass (Pennisetum purpureum Schum.) has a high yield with an annual capacity of 40 tons of dry matter per hectare (Woodard & Prine, 1993; Somerville et al., 2010), and an energy yield up to 25 times higher than energy consumed in its production (Collazzo et al. 2017). In this work a study on different cultivars of Elephant Grass (Pennisetum purpureum Schum.) was carried out. The cultivars tested were (Pennisetum purpureum Schum.) cv. Mott (MEG), (Pennisetum purpureum Schum.) cv. Roxo (REG) and (Pennisetum purpureum Schum.) cv. Capiaçu (CEG). The biomasses were evaluated in terms of Proximate analysis, Calorific Value, Ultimate Analysis, Structural Composition, Thermogravimetric Analysis, FRX, DRX, FTIR, flash pyrolysis at 600 ° C in Py-GC/MS and the evaluation of kinetic parameters by thermal analysis. The kinetic parameters of the samples were evaluated using Flynn-Wall and Model Free Kinetics (Vyazovkin) non-isothermal methods for the degradation range of holocellulose (hemicellulose and cellulose) from 150 to 370 ° C. The methods fit well with the MEG and REG samples. However for CEG, the models with linear fit proved to be unreliable to describe the kinetic parameters of the sample. The volatile compounds produced in pyrolysis were mainly oxygenated, including short chain oxygenated compounds (C1-C4), furans, esters, aldehydes, ketones and phenols. In general, the results obtained were similar for the three biomasses with only small variations in the yields of pyrolysis products. However, because it has a higher growth height, a HHV (16.22 MJ/kg) and one of the highest phenol contents, the CEG proved to be the most promising biomass to be studied for energy application among the other samples.

BANKING MEMBERS:
Externo à Instituição - EMERSON MOREIRA DE AGUIAR
Externo ao Programa - 277058 - GILSON GOMES DE MEDEIROS
Externo à Instituição - JANDUIR EGITO DA SILVA - IFAM
Presidente - 6347420 - MARCUS ANTONIO DE FREITAS MELO
Interna - 1979301 - RENATA MARTINS BRAGA