Fluidized bed reactor
AssigneeCERCA, Compagnie pour l'Etude et la Realisation de Combustibles Atomiques
InventorClaude Morin
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Abstract
The invention relates to a new type of fluidized bed reactor of the so-cad central jet type. This reactor has an annular shape such as that shown in the accompanying drawings. The annulus is defined by vertical cylindrical walls at its upper part, and by conical walls at its lower part, the latter walls being joined to one or more annular pipes. Such an arrangement considerably increases the capacity of the jet reactors. This reactor may be used for a large number of applications: preparation of nuclear fuels, drying of cereals, etc.
Claims12
In a central jet fluidized bed reactor in which systematic circulation of the particles comprising the bed is effected by at least one jet of fluid the combination comprising a reactor vessel having walls defining an upright generally annular upper chamber for containing the particles forming the fluidized bed, and means for centrally introducing a generally annular fluidizing stream upwardly into the annular chamber approximately equidistant from the walls wherein the particles of the bed are carried rapidly upward by the fluidizing stream as a diluted bed in a region whose axis is approximately equidistant from the walls which particles then travel down along the vicinity of the walls as a dense nearly unfluidized stream.
In a process of operating a fluidized bed dryer or reactor the improvement comprising the steps of:
- introducing particles to be treated into a generally annular chamber;
- and centrally introducing at least a generally annular stream of fluidizing medium generally upwardly through the particles for carrying the particles rapidly upward as a diluted bed in a region whose axis is approximately centrally disposed in the annular chamber causing the particles to then travel down along the outer regions of the annular chamber as a dense nearly unfluidized stream.
Dependencies are inferred from the claim text.