Análise do leito de jorro como sistema de contato para pirólise de compósito PEBD/AL

• Ano de defesa: 2014
• Autor(a) principal: Melo, Jardel Leno Zancanella
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Energia; UFES; Programa de Pós-Graduação em Energia
• Palavras-chave em Português: Energy; Computational fluid dynamics; Particulate systems; Solid waste; Multiphase flow; Sistemas particulados; Fluidodinâmica computacional; Escoamento multifásico; Teoria do transporte; Resíduos sólidos; Energia; Engenharia/Tecnologia/Gestão; 620.9
• Link de acesso: http://repositorio.ufes.br/handle/10/5341

In the last decade, several routes of waste cartons reusing have been proposed in the literature. Among other recovery processes, pyrolysis of carton residues has been highlighted due to make possible the manufacture of products with high added value, such as paraffin oils and aluminum bars. Recently, the spouted bed has been investigated as a promising reactor for pyrolysis of solids, due to its high rate of thermal exchange. However, in order to occur the pyrolysis appropriately is essential the study about the dynamics of air flow between solid residues in conical spouted bed. Thus, this research aims to analyze the flow of the LDPE/Al composite (in the form of pellets, ds = 2,58 mm) and mixtures of LDPE/Al composite and sand (ds = 2.58 mm) in a conical spouted bed. The experimental data of pressure drop are measured by a differential pressure transducer. These are assigned to an A/D interface, National Instruments. and processed on a computer by data acquisition program developed with Labview 10.0. The data of velocity of air are obtained by frequency inverter, which accompanies the experimental apparatus. The Eulerian model is used to describe the flow of air-solid in conical spouted bed. The equations of the model are addressed using the technique of computational fluid dynamics with the finite volume method, using a structured two-dimensional mesh. Among the tested turbulence models, the k-ɛ model dispersed seems to be appropriate to predict characteristic fluid dynamic behavior of the bed. The CFD simulations are adequate in this case study, underestimating the experimental values, where data for the minimum spouting velocity (Vmj), pressure drop of minimum spouting (ΔPmj) and maximum pressure drop in the bed (ΔPmax) have a maximum deviation of -13.5; -9.5 and -23, respectively. Analyzing the stability of the bed, to use mixtures with LDPE/Al composite mass fraction between 20 and 40% is recommended.