کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6467836 | 1423262 | 2017 | 8 صفحه PDF | دانلود رایگان |
- Examine layer inversion in gas-liquid-solid fluidized beds with binary solids.
- Liquid layer-inversion velocity increases at initial bed contraction.
- Liquid layer inversion velocity decreases at initial bed expansion behavior.
Layer inversion in gas-liquid-solid fluidized beds with binary solids was examined in a semi-acrylic column of 1.8Â m height and 0.21Â m inner diameter. Binary solid combinations were composed of polymer beads (PB, dp=3.3Â mm, Ïs=1,280Â kg/m3) and glass beads (GB, dp=0.385Â mm, Ïs=2500Â kg/m3). Five volumetric ratios (PB:GB=0.67:0.33, 0.6:0.4, 0.5:0.5, 0.4:0.6, 0.33:0.67) were used with superficial liquid velocities of 21.6-34.2Â mm/s, and superficial gas velocities of 0 to 16.6Â mm/s. Bubble size, bed height, and superficial liquid velocity at the layer inversion point vary with the binary composition. Upon gas introduction into a liquid-solid fluidization column, the superficial liquid layer-inversion velocity increased if it occurred when there was initial bed contraction. On the other hand, the liquid layer inversion velocity decreased when there was initial bed expansion. For all binary solid combinations showing initial bed expansion, liquid layer-inversion velocity decreased with increasing superficial gas velocity in three-phase fluidization, consistent with the gas-perturbed liquid model.
Journal: Chemical Engineering Science - Volume 157, 10 January 2017, Pages 99-106