Patent ID: 6253465
Filing Date: 2001-07-03
Classification: B01J,B03B,F26B

Abstract:
A multi-chamber fluidized bed classifying apparatus which applies at least one of drying, heating and cooling on powder and granular material and which includes a fluidized bed for classifying the powder and granular material into fines and grains, comprising:a main body for processing the powder and granular material therein, the main body being provided, on a lower part thereof, with a lower opening;a perforated gas distributing plate having a number of nozzles to cover the lower opening of the main body;a vertical partition plate for dividing the interior of the main body into at least one processing chamber arranged on the upstream side of the main body to perform at least one of drying, heating and cooling processes and a classifying chamber arranged on the downstream side of the main body to perform a classifying process;a communication passage defined under the partition plate to communicate the processing chamber with the classifying chamber;a hopper-shaped wind box on the processing chamber's side, arranged under the perforated gas distributing plate on the underside of the processing chamber;an discharge unit on the processing chamber's side, arranged on the lowermost end of the wind box on the processing chamber's side, for discharging falls falling into the wind box;a processing fluidization-gas supply system connected to the wind box on the processing chamber's side, for supplying fluidization gas used for at least one of drying, heating and cooling processes into the wind box;control means arranged in the processing fluidization-gas supply system, for controlling at least one of quantity and temperature of the fluidization gas supplied into the wind box on the processing chamber's side;a hopper-shaped wind box on the classifying chamber's side, arranged under the perforated gas distributing plate on the underside of the classifying chamber;an exhaust unit on the classifying chamber's side, arranged on the lowermost end of the wind box on the classifying chamber's side, for discharging falls falling into the wind box;a classifying fluidization-gas supply system connected to the wind box on the classifying chamber's side, for supplying fluidization gas used as classifying gas into the wind box;flow control means arranged in the classifying fluidization-gas supply system, for controlling a quantity of the fluidization gas supplied into the wind box on the classifying chamber's side;a material supply chute connected to an end of the processing chamber on the uppermost stream side, for supplying the powder and granular material into the main body;a grains discharge chute connected to another end of the classifying chamber on the lowermost stream side, for discharging the processed coarse brain from the main body; andgas exhaust ports arranged on the processing and classifying chambers, for spouting exhaust gas containing the fines;wherein the powder and granular material supplied through the material supply chute is fluidized in the processing chamber by the processing gas thereby to perform at least one of drying, heating and cooling processes and subsequently, the powder and granular material is transferred through the communication passage into the classifying chamber to classify the material in the classifying chamber and the so-classified coarse powder is discharged out of the main body through the grains discharge chute.