Fluidized Reactors
Mostrando 13-24 de 33 artigos, teses e dissertações.
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13. Parameter estimation for LLDPE gas-phase reactor models
Product development and advanced control applications require models with good predictive capability. However, in some cases it is not possible to obtain good quality phenomenological models due to the lack of data or the presence of important unmeasured effects. The use of empirical models requires less investment in modeling, but implies the need for large
Brazilian Journal of Chemical Engineering. Publicado em: 2007-06
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14. Study of continuous fermentation process for ethanol production using self-immobilized cells in fixed bed tower reactors / Estudo do processo fermentativo continuo para produção de etanol utilizando celulas auto-imobilizadas em reatores tipo torres
using flocculation yeasts of Saccharomyces cerevisiae in fixed bed tower reactors for ethanol production. We sought, through this job, the selection between four flocculent yeasts strains with appropriate metabolic profile to work in this kind of reactor. The selected yeasts strains present strong flocculent characteristics and there is no need to use cell s
Publicado em: 2007
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15. Simulação de escoamentos gás-sólido reativos em leitos fluidizados circulantes / Simulation of reactive gas-solid flows in circulating fluidized beds
Circulating fluidized bed reactors are widely used in large scale applications such as catalytic cracking of petrol and coal combustion. Development and design in those areas are strongly based on demonstration plants, at extremely high costs. In this context, treatments applying computational fluid mechanics assume considerable relevance. The complex gas-so
Publicado em: 2006
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16. Desempenho de um reator aeróbio de leito fluidizado no tratamento de esgoto sanitário. / Performance of an aerobic fluidized bed reactor in sanitary sewage treatment.
Apresenta-se a investigação experimental do tratamento de esgoto sanitário, submetido apenas a gradeamento, por meio de reatores aeróbios de leito trifásico com circulação em tubos concêntricos induzida por injeção de ar. Foram construídos dois reatores com 0,25m de diâmetro externo, 0,20m de diâmetro interno e alturas de 6m (R6) e 12m (R12). O
Publicado em: 2006
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17. 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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18. Avaliação de partículas poliméricas como material suporte em reator anaeróbio de leito fluidizado no tratamento de fenol.
This work had as objective studies of the biofilms formation in polymerics particles used as material supports in anaerobic fluidized-bed reactors. Three polymerics supports were tested: polystyrene, PET and PVC, which suffered appropriate acid treatment, in way to provide them superficial characteristics as rugosity, porosity and favorable electric charge,
Publicado em: 2005
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19. Simulation of the gas-solid flow in a vertical cylindrical duct in fast-fluidized bed applying the CFD technique / Simulação do escoamento gas-solido em um duto cilindrico vertical em leito fluidizado rapido aplicando a tecnica CFD
A presente pesquisa apresenta a modelagem matemática e a simulação de uma operação de fluidização rápida em um longo duto cilíndrico vertical, operação importante em vários processos industriais, sendo que sua principal aplicação está vinculada ao craqueamento catalítico do petróleo para a conversão em gasolina. Tem como objetivos a obtenç
Publicado em: 2005
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20. Experimental tests of biomass fast pyrolysis in fluidized bed reactor criteria to system optimization / Testes em uma planta de pirolise rapida de biomassa em leito fluidizado : criterios para sua otimização
This research discusses a strategy to optimize and scale up the pyrolysis process in fluidized bed. The strategy uses adjusted mathematical models applied to the model reactor to the project commercial reactors. Several steps of that procedure were appraised based on the adjusted model for the percentage of elutriated fine charcoal in the model reactor. It w
Publicado em: 2004
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21. ESTUDO FLUIDODINÂMICO E CINÉTICO DA USTULAÇÃO DE CONCENTRADOS DE SULFETO DE ZINCO EM REATOR DE LEITO FLUIDIZADO / FLUID DYNAMICS AND KINETICS STUDY OF ZINC SULPHIDE CONCENTRATES ROASTING IN FLUIDIZED BED REACTOR
This work presents a fluid dynamics and kinetics study of the roasting of zinc sulphide concentrates at 950¢XC. The data were collected in the literature for experiments carried out in an industrial fluidised bed reactor with an excess of oxygen. The theoretical and experimental characterisation was conducted with the operating variables of the industrial r
Publicado em: 2002
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22. Fluid dynamic modelling and simulation of circulating fluidized bed reactors: importance of the interface turbulence transfer
The main objective of this work is to analyze the importance of the gas-solid interface transfer of the kinetic energy of the turbulent motion on the accuracy of prediction of the fluid dynamic of Circulating Fluidized Bed (CFB) reactors. CFB reactors are used in a variety of industrial applications related to combustion, incineration and catalytic cracking.
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
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23. 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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24. Modelagem e simulação de reatores de leito fluidizado para produção de polimeros
Polymerization processes represent an important sector of the chemical processing industry. Nowadays, polyethylene is, worldwide, the most consumed polymer, representing more than 40% of all thermoplastic consumption and production (1998). Since the end of the 80?s, polyethylene has been also produced in fluidized bed reactors by gas phase technology. But th
Publicado em: 1999