EXPERIMENTAL STUDY ON DRYING SEWAGE SLUDGE IN A CONTINUOUS FLUIDIZED BED
| Autor: | Chia-Ming Wang, 王嘉銘 |
|---|---|
| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 The drying characteristics of sewage sludge from CPT (Chinese Picture Tube Co.) were experimentally studied in a continuous fluidized bed. Experiments were carried out in a 90mm I.D., 1.3m in height laboratory-scale fluidized bed to visualize the effects of superficial air velocity (1.13~1.46Umf), inlet air temperature (30~60oC), bed temperature (30~60oC), feeding rate of sewage sludge (0.83~1.33g/s) and static bed height (130~190 mm). Sewage sludge was continuously fed to a fluidized bed with glass beads being fluidized by hot inlet air, then the time variations of humidity and temperature of inlet and outlet air were measured under different operating conditions. The experimental results indicate that the drying degree increases with increasing superficial air velocity, inlet air temperature, bed temperature and static bed height, but with decreasing feeding rate of sewage sludge. The performance of the continuous fluidized bed dryer can be predicted from continuous dryer kinetics and the residence time distribution of exited sludge. The calculated outlet moisture contents are in agreement with the experimental data within 15% in this study. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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