Scale-up of fluidized-bed hydrodynamics
The scale-up of fluidized beds is not an exact science. Deep fluidized beds of Group A materials can cause significant gas bypassing leading to poor gas-solids contacting.
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Title Link Category Author Company Application Date
L Valve Equations
Non-mechanical valves, especially the L-valves, have been used extensively in fluidized beds and circulating fluidized beds for solids recycling or to serve as a pressure seal. This paper presents a set of L-valve equations which relate the solids flow rate to the L-valve design, aeration rate, and pressure drop across the L-valve.
Intermittent injection of prepolymer in a pressurized fluidized bed
Inclined, intermittent jets can be used to feed solids into fluidized beds. In this report the injection system was successfully modeled.
A procedure to determine particle agglomeration in a fluidized bed and its effect on entrainment
Accurate predictions of both the flux and size distribution of the solids entrained above the transport disengaging height of a fluidized bed are necessary. A new correlation was developed to calculate size distribution and flux of entrained particles.
Simulation of particles and gas flow behavior in the riser section of a circulating fluidized bed using the kinetic theory approach for the particulate phase
Gas/particle flow behavior in the riser section of a circulating fluidized bed (CFB) was simulated using a computational fluid dynamics (CFD) package by Fluent. Gas and particle flow profiles were obtained for velocity, volume fraction, pressure, and turbulence parameters for each phase.
Dynamics of gas-particle flow in circulating fluidized beds
The flow of gas—particle mixtures in a circulating fluidized bed has been studied, probing the flow behavior under both stable and unstable operating conditions.
Standpipes and return systems
Although chemistry is the initial driving force for the development of chemical processes, in many instances the key to successful process operation is how well the solids transport systems have been designed. This is especially true in circulating fluidized bed (CFB) processes, because these processes are dependent upon rapid and reliable circulation of solids.