Three Phase Fluidized Bed
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Simulação trifásica por técnicas de CFD da combustão de carvão mineral em leito fluidizado circulante / Three-phase CFD simulation of coal combustion in a circulating fluidized bed reactor
A queima de carvão mineral em Leito Fluidizado Circulante (CFBC) tem interessado pesquisadores por várias décadas, tendo sido propostos inúmeros modelos matemáticos que visam descrever os complexos fenômenos de transferência de massa, energia e quantidade de movimento deste sistema gás-sólido. A fase sólida é uma mistura de materiais inertes, como
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/09/2012
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2. Metodologia para aplicar LES ao craqueamento catalítico fluido em um reator riser industrial / Large eddy simulation application methodology to a fluid catalytic cracking industry reactor
The main objective of this thesis is to propose a methodology in how to apply Large Eddy Simulation (LES) on a unit of catalytic cracking. In order to achieve this, it was proposed an alternative way of constructing the computational mesh, by using quasi-uniform meshes. The proposed meshes were implemented to minimize the computational effort and procedure f
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/09/2012
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3. Modeling and simulating the drying of grass seeds (Brachiaria brizantha) in fluidized beds: evaluation of heat transfer coefficients
This work is aimed at modeling the heat transfer mechanism in a fluidized bed of grass seeds (Brachiaria brizantha) for supporting further works on simulating the drying of these seeds in such a bed. The three-phase heat transfer model, developed by Vitor et al. (2004), is the one used for this proposal. This model is modified to uncouple one of the four adj
Brazilian Journal of Chemical Engineering. Publicado em: 2009-09
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4. Experimental and theoretical investigation of anaerobic fluidized bed biofilm reactors
This work presents an experimental and theoretical investigation of anaerobic fluidized bed reactors (AFBRs). The bioreactors are modeled as dynamic three-phase systems. Biochemical transformations are assumed to occur only in the fluidized bed zone. The biofilm process model is coupled to the system hydrodynamic model through the biofilm detachment rate; wh
Brazilian Journal of Chemical Engineering. Publicado em: 2009-09
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5. Secagem de sementes de gramíneas (Brachiaria brizantha) em leito fluidizado
Drying operation is an important stage of the processing that precedes the storage of seeds, since that with low moisture contents, these can retain their power of germination and other qualities for long periods. The objective of this work was to perform a study of drying of grass seeds (Brachiaria brizantha) in a batch fluidized bed, in order to evaluate t
Publicado em: 2008
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6. Experimental dynamic evaluation of three-phase reactors
The hydrodynamic parameters were determined for two different three-phase systems (fluidized-bed and trickle-bed) through the experimental evaluation of the dynamic residence time distribution in the gas or liquid phase. For different fluid phase flow rates the fluidized-bed system was operated with a tracer in the gas phase and in the trickle-bed with a tra
Brazilian Journal of Chemical Engineering. Publicado em: 2005-09
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7. The performance of a three-phase fluidized bed reactor in treatment of wastewater with high organic load
An experimental study was carried out aiming to evaluate the performance of a three-phase fluidized bed bioreactor (FBBR) used to treat milk wastewater. In this study three different concentrations of milk wastewater substrate (462, 825 and 1473 mg O2/L) were tested. Using the same number of support particles, the results demonstrate that the average efficie
Brazilian Journal of Chemical Engineering. Publicado em: 2004-06
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8. Estimation of particle concentration profiles in a three-phase fluidized bed from experimental data and using the wake model
Particles with a size distribution in the range of 34 to 468 µm were fluidized in a three-phase bed using low liquid and gas velocities. Particle size distribution and pressure profile measurements were carried out at different locations in the bed in order to study the influence of fluid velocities on segregation and dispersion of particles in different si
Brazilian Journal of Chemical Engineering. Publicado em: 2004-01
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9. Hydrodynamics Characteristics and Gas-Liquid Mass Transfer in a Three Phase Fluidized Bed Reactor
This paper presents the experimental characterization of hydrodynamics and gas-liquid mass transfer in a three-phase fluidized bed containing polystyrene and nylon particles. The influence of gas and liquid velocities on phase holdups and volumetric gas-liquid mass transfer coefficient was investigated for flow conditions similar to those applied in biotechn
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
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10. Oxidação umida catalitica da lignina em reatores trifasicos com produção de aldeidos aromaticos
The lignocellulosic material, representing the largest natural renewable resource, occurring in the plants under the cellulose form, hemicellulose, lignin and extractive, with the lignina corresponding about 30% of this total one. The routes of lignin chemical processing, with prominence for the oxidations processes, with the objective of vanilin production,
Publicado em: 2001
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11. Estudo da transferencia de massa num reator trifasico de leito fluidizado circulante na oxidação do etanol e acido acetico com celulas imobilizadas de Acetobacter S.P
The objective of this work is the study of the kinetic and oxygen transfer in the oxidation of ethanol to acetic acid by immobilized cells, in a circulating three phase fluidized bed bioreactor. In this context experiences with Acetobacter cells, free and immobilized by entrapment in sodium aginate were done. In the first phase of the study, a strain at Acet
Publicado em: 1992
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12. Estudo da oxidação de etanol a acido acetico por celulas do genero Acetobacter livres e imobilizadas em geis hidrofilicos
In this work, the effects of biocatalysts preparation conditions on the behavior of ethanol oxidation process to acetic acid were studied and a cellular inoculum preparation method was developed. Experiments involving free and immobilized Acetobacter cells in hydrophilic gels containing k-carrageenan, sodium alginate or citric pectin on their composition wer
Publicado em: 1991