粉粒流動層における微粒子平均滞留時間に関する研究　　微粒子粒度分布・静電気・湿度の影響

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タイトル別名
  • Studies on Mean Residence Time of Fine Particles in a Powder-Particle Fluidized Bed. Effect of Particle Size Distribution, Static Electricity, and Humidity.
  • フンリュウ リュウドウソウ ニ オケル ビリュウシ ヘイキン タイリュウ ジカ
  • Effect of Particle Size Distribution, Static Electricity, and Humidity
  • 微粒子粒度分布・静電気・湿度の影響

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The relationship between mean residence time of fine particles and operating conditions in a Powder-Particle Fluidized Bed was studied using silica sand (dp= 550 μm) as coarse particles and, Al(OH)3 (dp=1.4-15 μm) and Al2O3 (dp= 3 μm) as fine particles. Fine particles were fed continuously to the bed and data were obtained under steady state. The mean residence time of fine particles increased with a decrease in gas velocity and fine particle size. When the relative humidity of the fluidization gas was 75 %, the mean residence time of fine particles (Al(OH3), dp = 3 μm) was 3000 times as large as that of thefluidization gas. The effect of relative humidity depended strongly on the characteristics of charge with static electricity and wetting properties of the fine particles. There was a big difference in the mean residence time of each particle size when particle size distribution was wide. When the uniformity of the mean residence time of each particle size is needed, an adjustment of particle size distribution is required.

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