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Dynamic modelling of fluidisation in gas-solid bubbling fluidised beds
Powder Technology, 2017Abstract Formation of fluidised bubbles in a fluidised bed has significant impact on the design and scale-up of the bubbling fluidised bed. To fully understand bubble motions in the fluidised bed, fluidised bubble dynamics in a gas-solid fluidised bed is investigated using CFD-DEM numerical simulation.
Luming Chen +6 more
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Prediction of bubble size in a gas-fluidised bed
Chemical Engineering Science, 1976Abstract It is shown that existing data on bubble size (when this is not restricted by the vessel dimensions) can be described by where (U — Umf) is the excess gas flow, h is the height above the distributor and h0, a measure of the initial bubble size, characterises the distributor.
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Bubble formation in dense fluidized beds
Physics of Fluids A: Fluid Dynamics, 1991It has been known for a long time that fluidized beds of solid powder in gas may become unstable for certain values of relative and mass fraction, and that this behavior is important in determining the mixing properties of the bed. Several different mechanisms have been proposed for this instability, but no broad consensus is available on which are the
Juan A. Hernández, Javier Jiménez
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Effect of bed material on ammonia dissociation in a bubbling fluidised bed
International Journal of Hydrogen EnergyJianbo Li, Dongke Zhang
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The expansion of bubbling fluidised beds
Powder Technology, 1968Abstract The expansion of freely bubbling gas fluidised beds has been investigated experimentally in a 12-in. diameter bed and the influence of bed depth, gas velocity, particle size and particle-size distribution has been studied. Results are compared with theoretical predictions and new light is thrown on the assumptions inherent in the two-phase ...
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Combustion of polymer pellets in a bubbling fluidised bed
Combustion and Flame, 2011Abstract Single pellets (≈3 mm diameter) of high density polyethylene (HDPE) have been burned in an electrically heated bed of silica sand, fluidised by air or mixtures of N2 and O2 at atmospheric pressure. During the combustion of single pellets, measurements were made of the concentrations of CO and CO2 in the off-gas, enabling burnout-times to be ...
F. Burgess +3 more
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Solids motion in bubbling gas fluidised beds
Chemical Engineering Science, 2000Abstract Gas fluidised beds are widely employed in the chemical, petrochemical, metallurgical, and pharmaceutical industries. Solids mixing in such devices plays a central role in controlling product quality and productivity. This paper presents some observations of particle motion in 3-D gas fluidised beds operated in the bubbling mode and at ...
M Stein +3 more
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An x-ray study of bubbles in fluidised beds
Chemical Engineering Research and Design, 1997Synopsis Gas-fluidised beds are characterised by the formation of bubbles which rise through them and determine the pattern of particle movement and gas flow within. The basic nature and shape of the bubbles are of interest not only in predicting the overall behaviour of the bed (from a gas-solids contacting point of view, for example) but also when ...
P.N. Rowe, B.A. Partridge
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The combustion of polymer pellets in a bubbling fluidised bed
Fuel, 2006Abstract Wastes burned in incinerators usually contain polymers, whose combustion can be associated with noxious emissions, unless the conditions are properly selected. This paper investigates how polymers burn in a fluidised bed; in fact, the combustion of a number of polymers, including several types of polyethylene, polystyrene and a polyamide ...
J BARON +5 more
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On bubble flow in liquids and fluidised beds
Chemical Engineering Science, 1966Abstract An illustration of Nicklin's conclusions for two-phase flow is given, and application of these conclusions is made to the two-phase theory of fluidised beds. Some expressions previously derived for fluidised beds are believed now to require re-consideration.
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