粗粒子充填層内における微粉の透過速度

概要

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The percolating velocity of fines through the packed bed of glass beads of 4.5 and 12mm in diameter and silica gel spheres of 1.5mm in diameter was measured with bifurcated optical fiber probes. Silica-alumina particles of 68μm, alumina particles of 211μm and glass beads of 398μm were coated with a fluorescent dye, and were used as a tracer. When 1∿2cm^3 of the tracer particles was injected in the gas flow and exposed to ultraviolet light which was introduced with the silica fiber, visible light was emitted and transferred outward with the plastic fiber. The percolating velocity of fines was determined from the time period to pass the distance between the probes. The ascending velocity of fines increased with increasing gas velocity and size of packed particles. A flow model of fines was proposed on the basis of the successive collision of fines on coarse particles. The percolating velocity of fines agreed with the calculated value. The measuring system developed was proved to be able to detect the local percolating velocity of fines in packed bed. The ascending velocity near the column wall was higher than that in the core region.
社団法人日本鉄鋼協会の論文
1991-09-01