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On the Mechanism of Bubbling Fluidized-Bed Combustion of Gas Oil
Industrial & Engineering Chemistry Research, 2003A study has been carried out on atmospheric fluidized-bed combustion (FBC) of conventional liquid fuels at temperatures lower than the value classically adopted for FBC of solid fuels (i.e., 850 °C). The study comprised an experimental program of steady-state tests for characterization of the combustion mechanism, mainly through proper acquisition of ...
MICCIO F. +3 more
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Formation of bubbles in a fluidized bed
Powder Technology, 1974Abstract A bubble of a given radius in a gas-fluidized bed is shown to be sustained by the balance of an electric surface tension around the cavity produced by the electric charges on the particles in the fluidized bed, and the increase in static pressure in the cavity where the gas slows down as it flows through the cavity.
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Behaviors of the bubble, cloud, and emulsion phases in a fluidized bed
AIChE Journal, 2007AbstractAn intrusive bioptical probe provides radial profiles of the PDF (probability density function) of the bubble, the cloud, and the emulsion phases behaviors in a fluidized bed of Geldart‐A particles. The fluidizing velocity ranges between 0.20 and 0.80 m/s. The bed porosity, the overall averaged bubble chords and velocities are well‐predicted by
Andreux, Régis, Chaouki, Jamal
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Combustion of hydrogen in a bubbling fluidized bed
Combustion and Flame, 2009The combustion of hydrogen in a hot, bubbling bed of quartz sand fluidized by air has been studied for the first time, by injecting hydrogen just above the distributor, via six horizontal fine tubes of Cr/Ni. Overall the fluidizing gas was oxygen-rich, with the composition varying from nearly stoichiometric to very lean mixtures. With the bed initially
J. Baron +5 more
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1995
Experiments show that a bubble in a fluidized bed behaves like a large bubble in low viscosity liquid. Theory shows that interparticle forces are small round a rising bubble, justifying liquid-like behaviour and giving the rate of gas exchange between the bubble and the particles.
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Experiments show that a bubble in a fluidized bed behaves like a large bubble in low viscosity liquid. Theory shows that interparticle forces are small round a rising bubble, justifying liquid-like behaviour and giving the rate of gas exchange between the bubble and the particles.
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Bubble coalescence in fluidized beds
AIChE Journal, 1970AbstractThe two‐dimensional motion of two circular bubbles moving in train up through a fluidized bed is considered. By using continuum equations of motion for this two‐phase flow situation, neutral coalescence curves are obtained which indicate, for given bubble radii and distance apart, whether or not the bubbles will coalesce. The conclusions are in
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Motion of bubbles in a fluidized bed
Fluid Dynamics, 1975The steady-state motion of a bubble (a cavity free from suspended particles and occupied solely by the liquid phase) in a fluidized bed of uniform concentration is considered. The change in the shape of the bubble which takes place as it rises through the fluidized bed is established; the rising velocity is determined for both large and small bubbles ...
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Bubble Formation at an Orifice in a Fluidized Bed
Nature, 1961WHEN a gas is passed through a bed of solid particles supported by a porous distributor at a flow-rate sufficient to fluidize the bed, gas bubbles can usually be seen travelling up through the bed and breaking surface at the top. The properties of bubbles in fluidized beds have become the subject of considerable interest recently for the information ...
D. HARRISON, L. S. LEUNG
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Instabilities and the formation of bubbles in fluidized beds
Journal of Fluid Mechanics, 1995As is well known, most gas-fluidized beds of solid particles bubble; that is, they are traversed by rising regions containing few particles. Most liquid-fluidized beds, on the other hand, do not. The aim of the present paper is to investigate whether this distinction can be accounted for by certain equations of motion which have commonly been used to ...
Anderson, K. +2 more
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Chemical reaction in bubbling fluidized beds
Chemical Engineering Science, 1965Abstract A theory describing the flow within a bubble rising in a fluidized bed is given for both two- and three-dimensional systems. The theory is then related to the effect of bubbles on a fluid/solid reaction in a fluidized bed and three possible models for the fluid flow are outlined, from which it is possible to estimate the conversion in a ...
D.L. Pyle, P.L. Rose
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