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首页> 外文会议>China-Japan symposium on fluidization;CJF-6 >Hold up and elutriation rate of fine particles in a powder-particle spouted bed
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Hold up and elutriation rate of fine particles in a powder-particle spouted bed

机译：粉末颗粒喷射床中细颗粒的滞留和淘析率

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The hold up of aluminium hydroxide fine particles (Group C powders in Geldart's classification) in a spouted bed of coarse silica sand (Group D powders in Geldart's classification) and elutriation of the fine particles from the bed were investigated with a transparent cone-bottomed column of 10.0 cm in inside diameter, 100 cm high. In the experiment, fine particles were continuously fed to the spouted bed. The elutriation rate constant of fine particles and the hold up of fines in the bed were measured at steady state. The effects of superficial gas velocity, the feed rate of fines and the diameter of fine particles on the hold up of fines in the bed and the elutriation rate constant of fines from the bed were investigated. The results showed that the hold up of fines in the bed increased steeply whereas the elutriation rate constant declined sharply at a certain powder size less than 1 mum i naverage diameter, this may be attribted to the stronger cohesion force between particles.
机译：用透明圆锥形底部色谱柱研究了氢氧化铝细颗粒（在Geldart类别中的C组粉末）在粗硅砂的喷出床中的吸附（Geldart类别中的D组粉末），并用透明锥底柱从​​床中淘析了细颗粒。内径10.0厘米，高100厘米。在实验中，将细颗粒连续地进料到喷射床中。在稳态下测量细粒的淘析速率常数和床中细粒的滞留量。研究了表观气体速度，细粉的进料速度和细粒直径对床中细粉的滞留率以及床中细粉的溶出速率常数的影响。结果表明，在小于平均粒径1μm的特定粉末尺寸下，床层中细粉的滞留量急剧增加，而淘析速率常数则急剧下降，这可能归因于颗粒之间的较强内聚力。

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