Centrifugal fluidized-bed drying method and apparatus
AssigneeKrauss-Maffei Aktiengesellschaft
InventorsGunther Hultsch, Harald Bock
Life of this patent
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Abstract
Particles to be dried are loaded into the bottom of an upwardly open vessel which is then spun about a central axis at a speed sufficient to form the particles into an annular body and to urge the particles radially outwardly with a centrifugal force greater than the force of gravity. The outer wall of the vessel is gas-pervious and drying gas is passed radially inwardly through this wall to contact the particles and at least partially fluidize the body of particles. The dried particles are drawn off out of the upper end of the rotating vessel as fresh wet particles are loaded into the lower end.
Claims19
A method of treating particles comprising the steps of:
- (a) forming said particles into a body of particles centered on an axis;
- (b) rotating said body of particles about said axis at a speed sufficient to urge said particles radially outwardly with a centrifugal force;
- (c) passing a drying gas in a direction substantially opposite the centrifugal force inwardly through said body all around the latter and thereby contacting said particles and drying same;
- and
- (d) maintaining the speed of the gas in said direction at a level sufficient to counter the centrifugal force and keep said particles in a suspended state.
An apparatus for drying wet particles, said apparatus comprising:
- a vessel adapted to receive wet particles and having a circular cross section with an axis, a foraminous wall surrounding said axis and inlet means for admitting said particles to the vessel;
- drive means for rotating said vessel and particles therein about said axis at an angular speed sufficient to urge said particles radially outwardly with a centrifugal force;
- a housing spacedly surrounding said vessel and defining a space around said vessel;
- drive means for rotating said housing;
- and
- blower means for passing a drying gas through said space and at least partially radially inwardly through said foraminous wall and generally opposite to the centrifugal force at a speed sufficient to keep said particles in a suspended state along said wall.
Dependencies are inferred from the claim text.