Loading...

Principles of designing and fabricating of a laboratory vibro-fluidized bed dryer to study of moist materials fluidization

Sadeghi, M ; Sharif University of Technology | 2004

140 Viewed
  1. Type of Document: Article
  2. Publisher: 2004
  3. Abstract:
  4. To study of vibration effect on fluidization behaviour of high moisture materials, a laboratory vibro-fluidized bed dryer was designed and fabricated. The blower was selected based on transferring velocity of particles and pressure drop caused by airflow through the bedplate and the channels. It was centrifugal type with backward blades, static pressure of 3.5 kPa, flow rate of 0.4 m 3/s and impeller diameter of 0.4 m. The dryer was constructed with 4.9 kW electrical heater capacity, bed plate with holes diameter of I mm and 140626 holes/m 2. The dryer chamber was made of Plexiglass with 0.16×0.16 m square section and 0.5 m height The bedplate was vibrated mechanically, which was adjustable for amplitude (0-5 mm) and frequency (0-10 Hz). An automatic control system was utilized to control inlet air temperature and airflow rate. To evaluate the fluidization quality of the dryer, bed aerodynamic experiments were conducted on moist black tea particles. The result showed that at vibro-fluidized condition (frequency of 10 Hz and amplitude of 1 mm), there was no hysteresis in pressure drop vs. air velocity curve. Also channeling of bed was not observed in this case and minimum fluidization velocity was decreased from 0.762 to 0.5334 m/s in comparison with ordinary fluidized case. Therefore, there was a positive effect on fluidization quality of tea particles
  5. Keywords:
  6. Bed Aerodynamic ; Design ; Fabricate ; Fluid Bed Dryer ; Tea ; Vibration
  7. Source: Amirkabir (Journal of Science and Technology) ; Volume 15, Issue 58 B , 2004 , Pages 385-397 ; 10150951 (ISSN)
  8. URL: https://www.sid.ir/paper/687/en