A Single Particle View Of Fluidization,
2010
University of Warwick
A Single Particle View Of Fluidization, Jonathan Seville
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Radiation-based single particle tracking approaches have distinct advantages in investigating opaque particle systems such as fluidized beds. The principles of one of these – positron emission particle tracking (PEPT) – are summarised here, together with recent developments in the use of the technique. Applications in bubbling beds, circulating beds, in heat transfer and in coating are illustrated. PEPT is beginning to be used in validation of computational methods for simulating fluidized beds, such as discrete element methods.
Fluidization—Past & Future,
2010
Tokyo U A&T
Fluidization—Past & Future, Masayuki Horio
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
With the understanding on paradigm shift in sciences as well as on the relationships between science and society, the footmarks of fluidization research and its present situation were briefly revisited so that the future directions can be defined and discussed in the fluidization society in a wider perspective.
Book Cover,
2010
Korea Advanced Institute of Science and Technology
Book Cover, Sang Done Kim
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Book Cover
Particle Attrition Measurements Using A Jet Cup,
2010
Particulate Solid Research, Inc.
Particle Attrition Measurements Using A Jet Cup, Ray Cocco, S.B. Reddy Karri, Yeook Arrington, Roy Hays, John Findlay, Ted Knowlton
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Particle attrition is usually detrimental as it negatively affects product quality and process cost. Thus, it is important to know how particles attrit under relevant operating conditions. Small jet cup attrition test devices (such as the Davison Jet Cup) are typically used to measure relative particle attrition for fluidized beds and risers. Ideally, the attrition rates measured in these laboratory units provide a relative indication of how the materials will behave in the commercial unit. Most jet cup devices have a cylindrical configuration. However, Particulate Solid Research, Inc. (PSRI) has found that a cylindrical jet cup attrition measurement may not …
Effects Of Imposed Solids Flux And Pressure On Gas Bypassing In Deep Fluidized Beds Of Group A Materials,
2010
PSRI, Chicago
Effects Of Imposed Solids Flux And Pressure On Gas Bypassing In Deep Fluidized Beds Of Group A Materials, Allan Issangya, Reddy Karri Dr, Ted Knowlton
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Tests were conducted in 0.6-m and 0.9-m-diameter units to determine the effect of imposed solids flux and system pressure on gas bypassing in deep beds of FCC catalyst particles. Imposed solids fluxes of up to 70 kg/m2s and freeboard pressures of up to about 200 kPag were used. Imposing a solids flux on the fluid bed increased the potential for gas bypassing, while increasing the system pressure had the opposite effect.
Magnetic Resonance (Mr) Measurements Of The Mass Flux In Gas-Solid Fluidized Beds,
2010
University of Cambridge
Magnetic Resonance (Mr) Measurements Of The Mass Flux In Gas-Solid Fluidized Beds, Andrew J. Sederman, Daniel J. Holland, L. F. Gladden, J. S. Dennis, C. R. Müller
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Magnetic Resonance (MR) Imaging was used to measure the time-averaged voidage and particle velocity in a 3D gas-solid fluidized bed. Two different distributors were used. The mass-flux through a horizontal plane was calculated by combining the local voidage and particle velocity measurements. Based on the conservation of mass it was possible to give an error in the combined voidage and particle velocity measurements. It was found that the error in the mass flux was usually small (< 5%), albeit increasing with increasing fluidization velocities.
Study Of Solids Entrainment Into Attrition Jets In Fluidized Beds,
2010
The University of Western Ontario
Study Of Solids Entrainment Into Attrition Jets In Fluidized Beds, Feng Li, Cedric Briens, Franco Berruti, Jennifer Mcmillan
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Supersonic nozzles are applied to various fluidized bed processes, such as the production of pharmaceutical powders, fluid catalytic cracking, and fluid coking. In applications such as jet milling, it is essential to entrain a maximum flow-rate of solids from the fluidized bed into the jet cavity. Studies of solid entrainment rate into gas jets have been mostly conducted with subsonic jets and none with convergent-divergent nozzles. The purpose of this research is to study solids entrainment into jets issuing from supersonic convergent-divergent nozzles, and particularly the effects of nozzle size, nozzle mass flow-rate, injection gas properties and fluidization velocity. A …
Evaluation Of The Minimum Velocity Of Polydisperse Bed Fluidization Compounded Of Biomass Pellets And Their Mixtures With Fine Particles Of Coal,
2010
Tambov State Technical University
Evaluation Of The Minimum Velocity Of Polydisperse Bed Fluidization Compounded Of Biomass Pellets And Their Mixtures With Fine Particles Of Coal, Zorin Alexander, Isemin Rafail, Viryasov Dmitriy, Kuzmin Sergey
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
It turned out that the change graphs of the absolute value of dimensionless amplitude of pressure fluctuations against air velocity can be used to evaluate values of the minimum fluidization velocity of polydisperse bed biomass pellets. An experimental verification is reported on the early predicting index of agglomeration in bubbling fluidized bed of biomass pellets and fine coal particles.
Processing Of Pure Vegetable Oils In A Continuous Fcc Pilot Plant,
2010
Vienna University of Technology
Processing Of Pure Vegetable Oils In A Continuous Fcc Pilot Plant, Peter Bielansky, Alexander Reichhold, Christoph Schönberger
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The basic objective of the presented work is the application of vegetable oils as an alternative CO2-neutral feedstock for fluid catalytic cracking (FCC). The experimental test program was conducted in a fully continuously operated FCC pilot plant with intern CFB-design at Vienna University of Technology. Vegetable oils with the highest global production (soy bean oil, palm oil and rapeseed oil) were used. The addition of vegetable oil had hardly any influence on the cracking process. The gasoline achieved is oxygen free at high octane numbers.
Effects Of Liquid Swirling On Gas-To-Liquid Mass Transfer In Three-Phase Fluidized Beds,
2010
School of Chemical Engineering, Chungnam National University, Daejon 305-764, Korea.
Effects Of Liquid Swirling On Gas-To-Liquid Mass Transfer In Three-Phase Fluidized Beds, Yong Kang, Myung-Jae Seo, Hyung Oh Lim, Sung-Mo Son, Yong Jun Cho, Hi Chul Yang, Sang-Done Kim, Heon Jung, Ho Tae Lee
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The swirling flow mode of liquid phase was adopted to promote the gas-to-liquid mass transfer in three-phase(gas-liquid-solid) fluidized beds. Effects of gas(0.01-0.09m/s) and liquid(0.035-0.172m/s) velocities, particle size(1.7-6.0mm) and swirling ratio of liquid phase(0-0.5) on the volumetric gas-to-liquid mass transfer coefficient in the bed were examined. The mass transfer coefficient increased up to 70% by adjusting the swirling flow of liquid phase, especially when the gas velocity is relatively low range. The value of gas-to-liquid mass transfer coefficient was well correlated in terms of dimensionless groups which were derived from the dimensional analysis on the mass transfer system.
Radial Distribution Of Particle Clusters In A Downer Reactor Unit,
2010
The University of Western Ontario
Radial Distribution Of Particle Clusters In A Downer Reactor Unit, Mohammad Ashraful Islam, Stefan Krol, Hugo Ignacio De Lasa
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
This study investigates the formation of clusters at 11 radial positions in a 2.63 cm ID downer reactor using the CREC-GS-Optiprobes. Cluster properties such as dimensions, drag coefficients and velocity across the downer unit radius are established based on the reported data and a probabilistic based model.
Pressure Balance Of A Multiple-Loop Chemical Reactor,
2010
CSIRO Process Science and Engineering
Pressure Balance Of A Multiple-Loop Chemical Reactor, Trevor D. Hadley, Ken Chiang, Nick R. Burke, Kok-Seng Lim
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
For a chemical looping (CL) process it is important to determine the optimum reactor configuration that would offer good pressure balance to ensure smooth transfer of the solids between the reactor loops as well as satisfying the oxygen carrier and heat requirements. A variation of the CL process for production of enriched hydrogen stream is investigated which adopts multiple reactor loops. A pressure balance model is developed and a methodology is proposed to find a feasible reactor configuration at an industrial scale production of hydrogen.
Steam Gasification Of Low Rank Coal Chars In A Thermobalance Reactor And A Fluidized Bed Reactor,
2010
Kunsan National University
Steam Gasification Of Low Rank Coal Chars In A Thermobalance Reactor And A Fluidized Bed Reactor, Byungho Song, Xueyan Zhu, Woongsig Moon, Won Yang
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The six chars of low rank coals have been gasified with steam in a thermobalance reactor and one lignite in a fluidized bed to obtain the kinetic information needed for a design of coal gasifier. The gas-solid reaction models have been compared for their prediction ability of the gasification reaction behavior. The apparent reaction rate equations have been presented.
Numerical Experiment On Effect Of Surface Roughness For Heat And Flow Around Two Contacting Particles,
2010
Okayama University of Science
Numerical Experiment On Effect Of Surface Roughness For Heat And Flow Around Two Contacting Particles, Azri Bin Alias, Kuwagi K., Bin Mokhtar M.A. Takami T., Horio M.
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
The aim of the present work is to establish a model of heat transfer between particles by using the numerical simulation that can be incorporated in the discrete element method (DEM). The contact heat transfer between particles can be regarded as a contact thermal resistance problem. In the thermal resistance model, the local characteristics, e.g. exact contact area and heat flux distribution on particle surface, are important. However, it is difficult to measure such factors in detail. Accordingly, the authors utilized a numerical simulation. The thermal resistance was modeled by placing a small solid block between the contacting areas in …
Study Of The Minimum Spouting Velocity In A Draft Tube Conical Spouted Bed,
2010
University of the Basque Country
Study Of The Minimum Spouting Velocity In A Draft Tube Conical Spouted Bed, Haritz Altzibar, G. Lopez, M. Olazar, J. Bilbao
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
A study has been carried out on the hydrodynamics of conical spouted beds with a non-porous draft-tube. A hydrodynamic correlation has been proposed for calculating the minimum spouting velocity as a function of dimensionless moduli that take into account geometric factors, particle characteristics and operating conditions. A statistical analysis of the data obtained following a design of experiments shows that the inlet diameter, particle diameter and the height of the entrainment zone are the parameter of greater influence on the minimum spouting velocity.
Dem-Cfd Modelling Of A Fluidized Bed Spray Granulator,
2010
Hamburg University of Technology
Dem-Cfd Modelling Of A Fluidized Bed Spray Granulator, Lennart Fries, Sergiy Antonyuk, Stefan Heinrich, Stefan Palzer
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Coupled DEM-CFD simulations have been performed to study the hydrodynamics of a Wurster granulator on the scale of individual particles. Based on extensive material tests, the collision behaviour of dry "Gamma"-Al2O3 particles is identified and incorporated into the model. The effect of process parameters like air flow rate and geometry details like the Wurster position is studied. Based on a physical description of the material properties, an effective tool for design and scale-up of a Wurster granulator is obtained.
Computational Study Of Layer Inversion In Two-Component Liquid-Fluidized Beds By Dem-Cfd,
2010
Università della Calabria, Italy
Computational Study Of Layer Inversion In Two-Component Liquid-Fluidized Beds By Dem-Cfd, Alberto Di Renzo, Fernando Cello, Francesco Paolo Di Maio
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
In the present work the layer inversion phenomenon observed in experiments from the literature is reproduced via discrete element simulations, in which a novel drag force model valid for bi- and poly-disperse particle systems is used. The simulations serve both as validation of the drag model and as a tool to analyze the dynamics of the phenomenon. The comparison with published data is carried out in terms of bed height and component distributions as functions of the liquid velocity, showing very good agreement.
Zero-Dimensional Modeling Of Indirect Fluidized Bed Gasification,
2010
Chalmers University of Technology, Sweden
Zero-Dimensional Modeling Of Indirect Fluidized Bed Gasification, Anton Larsson, David Pallarés, Daniel Neves, Martin Seemann, Henrik Thunman
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Zero-dimensional models has been developed to investigate mass balance and fuel (biomass) Chalmers a 2-4MW indirect fluidized bed gasifier. The result from this work is that more than 95%(Mass) of the tars is converted in the gasifier and that the water gas shift reaction is far from equilibrium.
Dem Fluidization Of Smart Particles,
2010
Tokyo University of Agriculture and Technology
Dem Fluidization Of Smart Particles, Amit Suri, Masayuki Horio
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Numerical simulations using DEM for smart particles/bodies having a capability to induce a repulsive force on the particle based on the cognition were simulated. A particle-particle interaction type repulsive force was used to induce self fluidization and it was found that if the repulsive force is sufficiently high, fluidization of particles can be achieved.
Inside Photo,
2010
Korea Advanced Institute of Science and Technology
Inside Photo, Sang Done Kim
The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering
Inside Photo
