Banca de DEFESA: GIULIA CRUZ LAMAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : GIULIA CRUZ LAMAS
DATE: 15/12/2023
TIME: 09:00
LOCAL: Sala de reuniões ENM – FT
TITLE:

Valorization of Urban Waste into Clean Energy: Integrated Torrefaction and Gasification System for Hydrogen Production and CO2 Reduction

KEY WORDS:

Gasification. Torrifacton. RSM. LCA.

PAGES: 74
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

This study aims to evaluate torrefaction as a pretreatment and simulate steam co-gasification of Hybrid Blends (HB) composed of Urban Solid Waste (USW) and Urban Forest Residues (UFR) from Brasília, Federal District. UFR samples consist of a mixture of lignocellulosic residues from the pruning of the six most representative trees in the Federal District. Regarding USW, it was based on the main components of the landfill in the region (Jockey Landfill), which are paper and cardboard, plastic, and organic waste. Experimental (torrefaction), numerical (thermodynamic gasification equilibrium model), and optimization techniques (response surface methodology – RSM) were used to examine the gasification process aiming for the production of: (i) hydrogen-rich gas; and (ii) gas with enhanced calorific value. The effects of torrefaction treatment (225, 250, and 275°C for 60 minutes with a heating rate of 5°C min−1), steam/biomass ratio (0.4, 0.6, 0.8, 1.0, and 1.2 S/B), and proportions of the hybrid blend, 50/50%; 70/30%, and 100/0% (UFR/USW) were investigated. The syngas was evaluated for hydrogen and carbon dioxide content (H2% and CO2%), exergetic efficiency of H2 production (η_(H_2 )), lower heating value (LHV), and cold gas efficiency (CGE). Through RSM, optimal conditions for gasification at 600°C were defined: (i) 0.9 S/B with an HB composed of 31% USW and 69% UFR torrefied at 275°C, showing an η_(H_2 ) of 49%; and (ii) 0.4 S/B with an HB containing 23% USW and 77% UFR torrefied at 275°C, with an LHV of 6126 kJ Nm–3. Finally, the results of the Life Cycle Assessment (LCA) indicate that Scenario (ii) has higher environmental impacts than Scenario (i) in syngas production. The choice between scenarios should consider environmental, technological, and economic factors, highlighting the importance of LCA in the effective management of waste valorization and mitigation processes. 

COMMITTEE MEMBERS:
Interno - 2348930 - ARMANDO DE AZEVEDO CALDEIRA PIRES
Presidente - 3138349 - EDGAR AMARAL SILVEIRA
Externa ao Programa - 1720225 - SANDRA MARIA DA LUZ - UnBExterno à Instituição - THIAGO DE PAULA PROTÁSIO - UFRA