New Ways Of Fluidization In A Centrifugal Field
Author(s)
J. De Wilde
Abstract
Both numerical and experimental observations on two novel technologies for
fluidization in a centrifugal field are presented.
In the rotating fluidized bed in a static geometry, the rotating motion of
the particle bed is generated by the tangential injection of the fluidization gas
in the fluidization chamber via multiple gas inlet slots, so i.e. by the tangential
fluidization of the particle bed. The fluidization gas is forced to leave
the fluidization chamber via a centrally positioned chimney results in a combined
tangential-radial motion of the fluidization gas through the particle bed. In case
the radial gas-solid drag force balances the centrifugal force, radial fluidization
of the particle bed can be obtained. As a result of the tangential fluidization of
the particle bed in rotating fluidized beds in a static geometry, radial fluidization
of the particle bed is, however, not necessary to take full advantage of the
improved particle bed uniformity and the higher gas-solid slip velocities at which
fluidized beds can be operated in a centrifugal field.
The rotating chimney can be combined with any rotating fluidized bed
technology and allows increasing locally, i.e. in the vicinity of the chimney, the
centrifugal force. The rotating chimney consists of multiple blades and rotates in
the same sense than the rotating particle bed, but at higher rotational speeds. The
fluidization gas is forced through the chimney blades to the chimney outlet. As a
result of the centrifugal force generated by the rotating chimney, particles are not
entrained by the fluidization gas, but remain rotating around the chimney in a
fluidized state.
Keywords: fluidization, rotating fluidized bed, rotating chimney, process
intensification, centrifugal force.
Keywords
fluidization, rotating fluidized bed, rotating chimney, process
intensification, centrifugal force.
Related Book
Other papers in this volume
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