| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluidized bed apparatus which ensures good quality and high efficiency in coating processing and attains high product yield. SOLUTION: An air pulsating wave is supplied into a peripheral area 3b of a gas dispersion plate 3 from a second air supply route A2, wherein in the peripheral area 3b of a gas dispersion plate 3, the air pulsating wave supplied from the second air supply route A2 is caused to flow in a fluidized bed vessel 1 so as to direct to a lower opening of a draft tube 4. Granular particles P, which are made to descend in a spatial part outside the draft tube 4 and reach the vicinity of the bottom of the fluidized bed vessel 1, receive a dispersion action of the pulsating air, which is spouted in a pulsated state of predetermined frequency at a comparatively low flow rate from the peripheral area 3b of the gas dispersion plate 3, and are promoted to flow toward the lower opening of the draft tube 4 by the spouted directivity of the pulsating air. The granular particles P, which receive the dispersion action of the pulsating air and are promoted to flow toward the lower opening of the draft tube 4, are sucked smoothly in the draft tube 4 by an ejector effect of a high-speed air current to be generated in the draft tube and are made to ascend again in the draft tube 4. COPYRIGHT: (C)2009,JPO&INPIT
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