Fast Fluidized Bed
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. NUMERICAL SIMULATION OF COAL GASIFICATION IN A CIRCULATING FLUIDIZED BED GASIFIER
Abstract This paper presents a 3D full-loop simulation of a circulating fluidized bed gasifier. The model is validated with experimental results from the literature. The validated model is thereupon used to compare Bubbling Fluidized Bed (BFB) and Circulating Fluidized Bed (CFB) gasifiers to highlight the effect of a change in fluidization regime from bubbli
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
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2. An Environmental Friendly Flow-Injection Procedure for On Line Extraction and Spectrophotometric Determination of Gossypol in Cottonseed Meal
A fast, simple and inexpensive procedure is described for the determination of gossypol in cottonseed meal. The procedure is based on a flow injection analysis system and a complexation reaction with spectrophotometric detection at 620 nm. A fluidized bed column was used to implement the on line that was coupled to the extraction flow system in order to anal
J. Braz. Chem. Soc.. Publicado em: 2017-11
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3. Estudo experimental das emissões de NOx na combustão de carvão mineral brasileiro em leito fluidizado rapido / Experimental study of NOx emissions from brazilian mineral coal combustion in fast fluidized bed
O objetivo deste trabalho é avaliar as emissões de óxidos de nitrogênio (NO + NO2) durante a combustão de carvão mineral com adição de calcário dolomítico como adsorvente em leito fluidizado circulante (LFC). As variáveis de influência estudadas foram o excesso de ar, que variou entre 18 e 32 %, e a relação molar cálcio enxofre (Ca/S) que vari
Publicado em: 2009
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4. Arraste de partÃculas finas em um leito fluidizado e eficiÃncia de coleta de um ciclone dipleg
The system with a fluidized bed and a cyclone dipleg as gas-solid separator is used in industry in unities of circulating fluidization. Some applications are: the fluid catalytic cracking, to produce gasoline and heating oil and the beds of combustion. The principal variables to be identified in the cited system are the flux of entrained particles in the bed
Publicado em: 2008
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5. Influência da taxa de carregamento orgânico na degradação anaeróbia da vinhaça em reator de leito fluidizado
In this work, the mesophilic anaerobic degradation (35 C) of the sugar cane vinasse was studied in an anaerobic fluidized bed reactor (RALF) for 255 days. The reactor, built in acrylic and with a total volume of 4,192 cm3, was filled with polystyrene particles as a means support, occupying 70 % of the total volume, and operated with hydraulic retention time
Publicado em: 2008
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6. Assessment of mercury emissions from brazilian coal combustion in fast fluidized bed / Estudo das emissões de mercurio na combustão de carvão mineral brasileiro em leito fluidizado rapido
In this work, total mercury emissions from fast fluidized bed combustion of CE-4500 Brazilian coal and dolomite mixtures were quantified. Stack gas samples were collected downstream of a baghouse by using an isokinetic probe and U.S. E.P.A. n. 29 / ASTM-D-6784 (Ontario-Hydro) method procedures. The ash samples trapped in the particulate control device and th
Publicado em: 2007
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7. Study of fast pyrolysis of sugarcane bagasse in a bubbling fluidized bed / Estudo da pirolise rapida de bagaço de cana em reator de leito fluidizado borbulhante
The energy content of biomass can be exploited by direct combustion or after conversion by physical, biological and thermochemical processes. Among the thermochemical processes there is the pyrolysis that is an attractive process because it provokes the conversion of solid biomass into liquids products. Such conversion presents many advantages in transport,
Publicado em: 2006
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8. 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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9. Time series analysis of pressure fluctuation in gas-solid fluidized beds
The purpose of the present work was to study the differentiation of states of typical fluidization (single bubble, multiple bubble and slugging) in a gas-solid fluidized bed, using spectral analysis of pressure fluctuation time series. The effects of the method of measuring (differential and absolute) pressure fluctuations and the axial position of the probe
Brazilian Journal of Chemical Engineering. Publicado em: 2004-09
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10. 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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11. Study of the elephant grass fast pyrolysis in a bubbling fluidized bed reactor throught the fine charcoal characterization / Estudo da pirolise rapida de capim elefante em leito fluidizado borbulhante mediante caracterização dos finos de carvão
Considerada uma forma inovadora de pirólise de materiais orgânicos, a pirólise rápida caracteriza-se por apresentar temperaturas moderadas, elevadas taxas de transferência de calor e massa e pequenos tempos de residência. Essas características fazem da tecnologia em leito fluidizado a mais apropriada para o melhor desenvolvimento dos processos físico
Publicado em: 2002
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12. Fast Kinetics of Fe2+ Oxidation in Packed-Bed Reactors
Thiobacillus ferrooxidans was used in fixed-film bioreactors to oxidize ferrous sulfate to ferric sulfate. Glass beads, ion-exchange resin, and activated-carbon particles were tested as support matrix materials. Activated carbon was tested in both a packed-bed bioreactor and a fluidized-bed bioreactor; the other matrix materials were used in packed-bed react