Engineering Commons^™

Motion Of A Large Object In A 2d Bubbling Fluidized Bed, Antonio Soria-Verdugo, L. M. García-Gutiérrez, S. Sanchez-Delgado, U. Ruiz-Rivas

The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering

The motion of a large object in a bubbling fluidized bed is experimentally studied using digital image analysis. A wide range of fluidized bed applications involves the motion of large objects within the bed, such objects being reactants, catalysts, agglomerates, etc.

The experiments were run in a 2D bubbling fluidized bed with glass spheres as bed material. The object motion is measured using tracking techniques, while independent measurements of the dense phase velocity (using PIV) and bubble velocity were carried out. The effect of the excess gas velocity on the object motion was also analyzed.

It is generally accepted that …

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 …

Mixing Behavior And Hydrodynamic Study Of Gassolid-Solid Fluidization System: Co-Fluidization Of Fcc And Coarse Particles, Zeeshan Nawaz, Yujian Sun, Yue Chu, Fei Wei

The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering

Gas-solid-solid (GSS) fluidization system is a unique piece of equipment and its features related to better mixing quality. The mixing and hydrodynamic behavior of FCC particles with coarse particles is investigated in 2D and 3D cofluidized beds. The reason of enhancing mixing and fluidization properties by adding coarse particles is particularly due to the movement of coarse particles, those breaks the strong interparticle forces between FCC particles and destroy bubble wake (bubble disassociation strategy), time to time. The attrition mass was measured by using Zeeshan relationship at designated conditions.

Prediction And Validation Of Effect Of Bed Length On Rtd Of Coal In A Bubbling Fluidized Bed, Zhihong Liu, Masahiro Narukawa, Makoto Takafuji, Toshiyuki Suda

The 13th International Conference on Fluidization - New Paradigm in Fluidization Engineering

The residence time distribution (RTD) of coal particles in a bubbling fluidized bed with continuous feeding is calculated with an extended convection-dispersion model, in which segregation of coal is accounted for. The effect of bed length on the RTD of coal is investigated, and the results are validated by experiments.

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.